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Tytuł:
Bayesian Spatial Quantile Regression
Bayesowska przestrzenna regresja kwantylowa
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/904804.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
quantile regression
spatial quantile regression
bayesian spatial model
Opis:
In this paper we present a Bayesian spatial model quantile regression. We develop a spatial quantile regression model that does not assume normality and allows the covariates to affect the entire conditional distribution, rather than just the mean. The conditional distribution is allowed to vary from site-to-site and is smoothed with a spatial prior.
W wielu zastosowaniach, podstawowym problemem jest opis i analiza wpływu wektora skorelowanych zmiennych objaśniających X na zmienna objaśnianą Y. W przypadku, gdy obserwacje badanych zmiennych są dodatkowo rozmieszczone przestrzennie, zadanie jest jeszcze trudniejsze, ponieważ mamy dodatkowe zależności, wynikające ze zmienności przestrzennej. Klasyczne podejście stosowane do takich problemów wykorzystuje założenie o skończonej wartości oczekiwanej zmiennych Y, wówczas przestrzenna funkcja regresji jest dobrze określona i dostarcza informacji o zależności zmiennej Y od zmiennych X. W tej pracy, w miejsce przestrzenna funkcja regresji wykorzystującej średnią, rozpatrzymy przestrzenna regresję kwantylową. Regresja kwantylowa zostanie omówiona w przestrzennym kontekście. Semiparametryczny model bayesowski i jego estymacja jest głównym celem tej pracy. Dodatkowe zasoby informacji o zmienności otrzymujemy badając kwantyle, wychodząc poza tradycyjny opis klasycznej regresji. Estymacja kwantylowa w modelu przestrzennym uwydatnia zależności przestrzenne dla różnych fragmentów rozważanych rozkładów.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 286
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Transformation Quantile Regression Model
Własności transformacji modelu regresji kwantylowej
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/905653.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
quantile regression
quantile regression model
Box-Cox transformation
Opis:
We present in this paper a few important direction on research using quantile regression. We start from some motivation for this method of regression. Secondly we present some main areas of application this method. Finally we wanted to point out transformation of the main model. This model, introduced by Powell (1991) and further analyzed by Chamberlain (1994) and Buchinsky (1995), specifies the conditional quantiles of the Box-Cox transformation of the variable under appraisal as a linear function of the covariates. It provides, within a simple set-up, the needed flexibility, as both the transformation parameter and the coefficients of the linear function are allowed to vary freely at each point of the distribution. The Box-Cox quantile regression, which has the linear and log-linear models as particular cases, will provide, therefore, a direct answer to the question of the appropriate transformation to be used.
Przedstawiamy artykuł, w którym omawiamy modele regresji kwantylowej. Omawiamy motywacje dla stosowania klasycznego modelu, jak również główne kierunki zastosowań regresji kwantylowej. Następnie przechodzimy do transformacji podstawowego modelu. Ten model jest wprowadzony przez Powell’a (1991) a kolejno analizowany przez Chamberlain’a (1994) i Buchinsky’ego (1995), wprowadzono specyficzne warunkowe kwantyle znane jako transformacja Box– Cox’a. Omawiamy estymację modeli oraz testy istotności.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2013, 285
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some tests for quantile regression models
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/657959.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
quantile regression model
test
Opis:
Przedstawiamy test weryfikujący jakość specyfikacji modelu regresji kwantylowej. Często wyznaczamy modele regresji kwantylowej i przeprowadzamy dalsze wnioskowanie analizując jedynie poziom błędów. Przedstawimy test dla funkcjonalnej formy modelu regresji kwantylowej. Test dopasowuje zmienną zależną jako wyjaśniającą oraz sprawdza istotność wprowadzonej do modelu zmiennej. Dodatkowo porównamy z nieparametryczną specyfikacją modelu wykorzystującą funkcję jądrową oraz przedział parametrów. Słowa kluczowe: test model regresji kwantylowej.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 255
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The determinants of fish catch: a quantile regression approach
Autorzy:
Plenos, M.C.F.
Powiązania:
https://bibliotekanauki.pl/articles/2080941.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
quantile regression
fishers
catch
Opis:
The goal of this study is to use quantile regression (QR) to find predictors of fishers’ catch and compare it with OLS regression. The heterogeneous association across the different quantiles of the catch distribution was investigated using QR analysis. The findings reveal that the effect changes depending on where a fisher is in the catch distribution. In the OLS, there are several non-significant predictors that appear to be significant in quantile regression. By OLS regression, demographic variables have little effect on fishers’ catch; but, in quantile regression, marital status, fishing hours, and use of motorized boats appeared to have a relatively high impact at the top of the distribution.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2021, 21[36], 2; 15-21
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Płeć matematyki”. Zróżnicowania osiągnięć ze względu na płeć wśród uzdolnionych uczniów
“THE GENDER OF MATHEMATICS”: GENDER DIFFERENCES IN HIGH MATHEMATICAL ACHIEVEMENTS AMONG STUDENTS
Autorzy:
Zawistowska, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/427764.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GENDER
QUANTILE REGRESSION
MATHEMATICS
PISA
Opis:
Research on performance in mathematics shows that an average achievement of men and women is only slightly different. A much bigger difference exists among students at high achievement levels; in this group, there are more boys than girls. This paper addresses the question how mathematical subdisciplines and types of tests shape gender proportion at higher percentiles of achievement distribution. An analysis of a wide range of data including the results of PISA, exams taken at the end of lower secondary school and high school as well as so-called “mathematical Olympics” brings out three conclusions: (1) there is a gender gap in all subscales of PISA scales, (2) the largest differences exist in scales related to spatial abilities, (3) gender gap widens together with an increase in the level of difficulty as well as with the transition to higher educational levels.
Źródło:
Studia Socjologiczne; 2013, 3(210); 75-95
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometryczne własności regresji kwantylowej
Geometric properties of the quantile regression
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/586341.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Kwantyle
Regresja kwantylowa
Własności modeli regresji kwantylowych
Property of quantile regression models
Quantile regression
Quantiles
Opis:
Zastosowania miar porządkowych, w tym kwantyli, znajdujemy w różnych obszarach zastosowań, w szczególności w statystyce odpornej. Odejście od klasycznego podejścia bazującego na momentach zmiennej losowej wynika zazwyczaj z analizowanego zbioru danych, który nie spełnia założeń modeli. Dwa pierwsze momenty zmiennej losowej, na których budujemy dalej modele regresji, nie są adekwatne w opisie zbiorów danych z obserwacjami odstającymi. Zbiory danych z asymetrycznymi rozkładami również nie powinny być analizowane z wykorzystaniem modeli regresji estymowanych MNK. Celem artykułu jest prezentacja własności geometrycznych regresji kwantylowej. To podejście metodologiczne wykorzystuje wartości rozkładu, wyznaczając zbiór kwantyli oraz zbiór modeli regresji.
The use of ordinal measures, including quantles, is found in various areas of application, in particular robust statistics. The retreat from the classical approach based on the moments of random variables is usually the result of a data set that does not meet the assumptions of the models. The first two moments of the random variable, on which we are building the regression models, are not adequate in describing the sets of observation data sets. Data sets with asymmetric distributions should also not be analyzed using regression models estimated by MNK. The aim of this paper is to present the geometrical properties of quantile regression. This methodological approach uses the values of the distribution of the random variables by determining the set of quantiles and the set of regression models.
Źródło:
Studia Ekonomiczne; 2017, 344; 145-157
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The distribution of wage inequality across municipalities in Mexico: a spatial quantile regres-sion approach
Autorzy:
Valdez, Rolando I.
García-Fernández, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/22443155.pdf
Data publikacji:
2022
Wydawca:
Instytut Badań Gospodarczych
Tematy:
wage inequality
spatial quantile regression
municipalities
Opis:
Research background: According to classical labor economics, wage differences among regions of a country that has free-factor mobility should eventually vanish. However, the level of wage inequality among Mexican territories is increasing. The nature and causes of this discrepancy are worth identifying. Purpose of the article: To identify the spatial relationship of wage inequality that existed in the Mexican metropolitan system during the years 2010 and 2015. Methods: We develop a model of wages that considers the interaction between spatial units within a region. Then, we specify a spatial autoregressive model with the average wage per municipality as a dependent variable. This variable is spatially lagged along with other controls such as productivity, schooling, and migration. We combine data from population and economic censuses. Then, we perform a quantile regression to estimate the spatial effect of wage in a region upon quartiles of the wage distribution. Findings & value added: Wage inequality increases within a given region when the average wage increases in one of said region?s municipalities. This phenomenon occurs because in municipalities that are neighbors of the one that enjoys a wage increase, the average wage tends to decrease. The impact is larger in those municipalities whose average wage is in the lower range of the regional wage distribution. Wage inequality is also increased by internal migration and increased productivity. These latter findings are some of the first for Mexico at this aggregation level. A novel aspect of our study is its use of territory as an observation unit for which statistics from population and economic censuses are combined to draw inferences about spatial inequality.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 3; 669-697
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of Differences in Income Distributions Using Quantile Regression
Autorzy:
Landmesser, Joanna Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/465969.pdf
Data publikacji:
2016
Wydawca:
Główny Urząd Statystyczny
Tematy:
decomposition of differences quantile regression
counterfactual distribution
Opis:
The paper deals with microeconometric techniques useful for the study of differences between groups of objects, methods that go beyond simple comparison of average values. Techniques for the decomposition of differences in distributions by constructing counterfactual distributions were considered. Using the Machado-Mata quantile regression approach the empirical decomposition of the inequalities in income distributions of one-person households in urban and rural areas was performed. We employed data from the Household Budget Survey for Poland in 2012. It was found that the tendency towards increased income inequalities between urban and rural residents when moving to the right of the income distribution can be observed. The rural residents are at a disadvantage. The decomposition of the inequalities revealed a growing share of the part explained by different characteristics of people and a declining share of the unexplained part, associated with the evaluation of those characteristics.
Źródło:
Statistics in Transition new series; 2016, 17, 2; 331-348
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of geostatistical analyst methods in discovering concealed gold and pathfinder elements as geochemical anomalies related to ore mineralisation
Autorzy:
Lindagato, P.
Li, Y.
Yang, G.
Duan, F.
Wang, Z.
Powiązania:
https://bibliotekanauki.pl/articles/94233.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
geochemical anomalies
geostatistical analyst
kriging interpolation
quantile-quantile plot
anomalie geochemiczne
analityk geostatystyczny
interpolacja krigingowa
wykres kwantyl-kwantyl
Opis:
The study area in the West Junggar Basin is known to be rich in hydrothermal gold deposits and occurrences, even though there has been minimum exploration in the area. It is here hypothesised that this area could host more gold deposits if mineral exploration methods were to be reinforced. This research is aimed at identifying geochemical anomalies of Au, and determining possible factors and conditions which facilitate the formation of anomalies by referring to As and Hg as gold pathfinders. Geostatistical analyst techniques have been applied to 9,852 stream sediments and bedrock data collected on a total surface of 1,280 km2 of West Junggar, Xinjiang (northwest China). The kriging interpolation and quantile-quantile plot methods, combined with statistical methods, successfully identified both Au and its pathfinders’ anomalies. In the present study, median was considered as background values (10.2 ppm for As, 9.13 ppb for Hg and 2.5 ppb for Au), whereas the 95th percentile were threshold values (28.03 ppm for As, 16.71 ppb for Hg and 8.2 ppb for Au) and values greater than thresholds are geochemical anomalies. Moreover, the high concentrations of these three discovered elements are caused primarily by hydrothermal ore mineralisation and are found to be controlled mainly by the Hatu and Sartohay faults of a northeast-southwesterly direction as well as their related secondary faults of variable orientation, which facilitate the easy flow of hydrothermal fluids towards the surface resulting in the formation of geochemical anomalies. Most of anomalies concentration of Au are found near the mining sites, which indicates that the formation of new Au anomalies is influenced by current or previous mining sites through geological or weathering processes. In addition, the low concentration of gold and its pathfinders found far from active gold mine or faults indicates that those anomalies are formed due to primary dispersion of hosting rock.
Źródło:
Geologos; 2018, 24, 2; 95-109
1426-8981
2080-6574
Pojawia się w:
Geologos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DECOMPOSITION OF DIFFERENCES BETWEEN PERSONAL INCOMES DISTRIBUTIONS IN POLAND
Autorzy:
Landmesser, Joanna Małgorzata
Karpio, Krzysztof
Łukasiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/453106.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
quantile regression
Machado & Mata decomposition
counterfactual distribution
Opis:
In this paper we study differences between personal incomes distributions in Poland in 2002 and 2012. The empirical data have been collected within the Household Budget Survey project. We used the Machado & Mata decomposition, which utilizes quantile regression. This method allowed us to investigate differences between income distributions in the whole range of values, going beyond simple average value decomposition. We evaluated influence of person’s attributes on the differences of incomes distributions in 2002 and 2012. By decomposing the differences into the explained and unexplained components we got information about their causes. The differences described by the explained part are caused by different characteristics of samples. The unexplained part shows differences caused by the changes of attribute importance.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 2; 43-52
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Households’ Borrowing Intentions During the COVID-19 Crisis: The Role of Financial Literacy
Autorzy:
Kurowski, Łukasz
Malinowska-Misiąg, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2162655.pdf
Data publikacji:
2022-07-31
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
borrowing intentions
financial literacy
instrumental variables
quantile regression
Opis:
This study aims to determine the role of financial literacy in households’ borrowing intentions during the coronavirus pandemic. Employing a survey of 1,300 Polish citizens conducted during the COVID-19 crisis and an instrumental variable analysis, we found that financial literacy significantly increases households’ borrowing intentions. This applies to financially sound consumers both in crisis and normal times. In terms of sociodemographic features, young adults and the less educated are less willing to borrow during the pandemic.
Źródło:
Journal of Banking and Financial Economics; 2022, 1(17); 98-113
2353-6845
Pojawia się w:
Journal of Banking and Financial Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
African stock markets’ connectedness: Quantile VAR approach
Autorzy:
Yaya, OlaOluwa
Adenikinju, Olayinka
Olayinka, Hammed A.
Powiązania:
https://bibliotekanauki.pl/articles/36095676.pdf
Data publikacji:
2024
Wydawca:
Fundacja Naukowa Instytut Współczesnych Finansów
Tematy:
Quantile dynamic connectedness
Market phases
Vector autoregression
portfolio management
normal market condition
lower quantile of returns
African stocks markets
Opis:
The present paper investigates African stock markets’ linkages by considering stocks in the continent’s largest economies, specifically Egypt, Kenya, Morocco, Nigeria, South Africa, and Tunisia. Using a dataset that spanned November 25, 2008, to September 18, 2023, the quantile connectedness approach of Chatziantoniou et al. (2021) is employed, and the results unfold these interesting dynamics of African market connectivity: (i) In the bearish market phase, South African stock dominated the entire network, transmitting shocks to the remaining stocks, while Moroccan and Kenyan stocks played similar role mildly. (ii) In the bullish market phase, Nigerian stock dominated the market as a major net transmitter of shock supported by South African and Kenyan stock markets. (iii), The Egyptian and Tunis stock markets are net shock receivers in both the bear and bull market phases. (iv), At the median quantile value, stocks become less riskier and the Kenyan stock market becomes the most vulnerable while Nigerian, Egyptian, and South African stock markets are influenced by other stock markets when markets are calm. (v), Though, African stocks are underperforming, interested portfolio managers will learn from the trading strategies to be adopted to maximize their returns. These findings will benefit portfolio managers, international stakeholders, and regulators.
Źródło:
Modern Finance; 2024, 2, 1; 51-68
2956-7742
Pojawia się w:
Modern Finance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the double-edged sword effect of environmental, social and governance practices on corporate risk-taking in the high-tech industry
Autorzy:
Teng, Xiaodong
Wu, Kun-Shan
Kuo, Lopin
Chang, Bao-Guang
Powiązania:
https://bibliotekanauki.pl/articles/19322776.pdf
Data publikacji:
2023
Wydawca:
Instytut Badań Gospodarczych
Tematy:
ESG
corporate risk-taking
quantile regression
sustainable development
Opis:
Research background: Corporate risk-taking (CRT) is crucial to a business's survival and performance and is a driving force for sustainable development. Environmental, social and governance (ESG) practices are critical to firm profits when considering sustainable economic growth; however, they can also be the cause of financial burdens. It is, therefore, crucial to assess the relationship between a company's ESG performance and its risk-taking. Purpose of the article: Considering the controversial results of empirical studies on the relationship between ESG and CRT, this study aims to theoretically and empirically investigate the curvilinear nexus between ESG practices and CRT within Taiwan's high-tech industry. Methods: Ordinary least square regression and quantile regression analysis was applied to investigate the curvilinear ESG-CRT relationship. The empirical studies were conducted in 38 high-tech companies on the Taiwan Stock Exchange that disclosed ESG information between 2005 and 2020, with a total of 437 firm-year observations. Findings & value added: Quantile regression estimation results reveal the ESG-CRT nexus is U-shaped (convex). Both the environmental and social pillar's relationship with CRT is nonlinear and U-shaped, whereas the governance pillar has no significant relationship with CRT. Overall, a comprehensive view is provided that shows ESG practices can have a double-edged sword effect on CRT. It is suggested that high-tech companies in Taiwan should avoid ESG practices becoming a tool for managements' self-interest. More information of ESG practices should be disclosed to stakeholders to ensure they are given full credit for the positive impact they have on capital allocation. Regulators guide firms to surpass the threshold of the U-shaped effect and take into consideration the whole benefits of stakeholders when they allocate existing resources toward environmental and social endeavors.
Źródło:
Oeconomia Copernicana; 2023, 14, 2; 511-549
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BOOSTING UNDER QUANTILE REGRESSION – CAN WE USE IT FOR MARKET RISK EVALUATION?
Autorzy:
Bień-Barkowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/453152.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
Boosting
quantile regression
GARCH models
value-at-risk
Opis:
We consider boosting, i.e. one of popular statistical machine-learning meta-algorithms, as a possible tool for combining individual volatility estimates under a quantile regression (QR) framework. Short empirical exercise is carried out for the S&P500 daily return series in the period of 2004-2009. Our initial findings show that this novel approach is very promising and the in-sample goodness-of-fit of the QR model is very good. However much further research should be conducted as far as the out-of-sample quality of conditional quantile predictions is concerned.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 1; 7-17
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE APPLICATION OF QUANTILE REGRESSION TO THE ANALYSIS OF THE RELATIONSHIPS BETWEEN THE ENTREPRENEURSHIP INDICATOR AND THE WATER AND SEWERAGE INFRASTRUCTURE IN RURAL AREAS OF COMMUNES IN WIELKOPOLSKIE VOIVODESHIP
Autorzy:
Kurzawa, Izabela
Lira, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/453848.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
quantile regression
entrepreneurship indicator
economic infrastructure
rural areas
Opis:
The article presents the usefulness of quantile regression for the analysis of diversification in entrepreneurship in rural areas of communes in Wielkopolskie Voivodeship. The dependence between the entrepreneurship indicator value and the density and availability of the water and sewerage infrastructure was determined for individual quantiles of the entrepreneurship indicator distribution. This approach enables estimation of different quantile functions of the conditional cumulative distribution function of the entrepreneurship indicator. This analysis enables atypical observations when the conditional cumulative distribution function is diversified and does not have a standard form.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 2; 33-42
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Estimation in VaR Modelling - Univariate Approaches using Bounded Innovation Propagation and Regression Quantiles Methodology
Autorzy:
Ratuszny, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/483341.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Robust estimation
quantile regression
CAViaR
ARMA-GARCH models
Opis:
In the paper we present robust estimation methods based on bounded innovation propagation filters and quantile regression, applied to measure Value at Risk. To illustrate advantage connected with the robust methods, we compare VaR forecasts of several group of instruments in the period of high uncertainty on the financial markets with the ones modelled using traditional quasi-likelihood estimation. For comparative purpose we use three groups of tests i.e. based on Bernoulli trial models, on decision making aspect, and on the expected shortfall.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2013, 5, 1; 35-63
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil price and the economic activity in GCC countries: evidence from quantile regression
Autorzy:
Zmami, Mourad
Ben-Salha, Ousama
Powiązania:
https://bibliotekanauki.pl/articles/22444397.pdf
Data publikacji:
2020
Wydawca:
Instytut Badań Gospodarczych
Tematy:
oil price
economic growth
cointegration
quantile regression
asymmetry
GCC
Opis:
Research background: The effects of oil price fluctuations on the macroeconomic performance in oil-importing and oil-exporting countries have stimulated considerable research activity. However, the debate is far from being closed. Purpose of the article: This paper revisits the impact of crude oil price on economic activity in the Gulf Cooperation Council oil-exporting countries. The study covers a relatively long period spanning from 1960 to 2018. Methods: The empirical investigation accounts for structural breaks, nonlinearity, and non-normal ?distribution of data. The Kapetanios (2005) structural breaks unit root test?? and ?Saikkonen?Lütkepohl (2000a, b, c) cointegration test with structural shifts are implemented to examine the stationary properties of data and the presence of cointegration between variables, respectively. Moreover, the quantile regression is employed to assess whether the impact of oil price on real GDP differs across different states of the economy. Findings & Value added: Empirical results suggest the absence of long-run cointegrating relationships between oil price and GDP in all countries. The quantile regression reveals that oil price does not affect real GDP in the same way across countries and for different business cycle phases. More specifically, the symmetric quantile regression findings reveal that oil price exerts a positive impact on GDP in all countries and that the effect is higher during the recession than expansion states. The asymmetric quantile regression shows that GDP reacts to positive oil price changes in all countries. However, only the Emirati and Omani GDPs are affected by negative oil price changes.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2020, 15, 4; 651-673
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Returns to Education and Gender Wage Gap Across Quantiles in Italy
Autorzy:
Furno, Marilena
Powiązania:
https://bibliotekanauki.pl/articles/2075508.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
quantile regression
decomposition
returns to education
gender wage gap
Opis:
Various quantile regression approaches are implemented to analyze the characteristics of Italian data on earnings in the tails. A changing coefficients pattern across quantiles shows increasing returns to education along the wage distribution. A quantile decomposition approach shows that higher education grants higher return at all quantiles, thus implying additional, non-linear returns to higher education throughout the entire pattern of the earning distribution. Wage gender gap displays a decreasing pattern across quantiles, and it does not disappear at the higher quantiles. The southern workers penalty decreases across quantiles as well for highly educated workers.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2020, 2; 145-169
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for estimating the probability distribution of the lifetime for new technical equipment based on expert judgement
Autorzy:
Andrzejczak, Karol
Bukowski, Lech
Powiązania:
https://bibliotekanauki.pl/articles/2038033.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
uncertainty
expert elicitation of lifetime
quantile function
Weibull distribution
Opis:
Managing the exploitation of technical equipment under conditions of uncertainty requires the use of probabilistic prediction models in the form of probability distributions of the lifetime of these objects. The parameters of these distributions are estimated with the use of statistical methods based on historical data about actual realizations of the lifetime of examined objects. However, when completely new solutions are introduced into service, such data are not available and the only possible method for the initial assessment of the expected lifetime of technical objects is expert methods. The aim of the study is to present a method for estimating the probability distribution of the lifetime for new technical facilities based on expert assessments of three parameters characterizing the expected lifetime of these objects. The method is based on a subjective Bayesian approach to the problem of randomness and integrated with models of classical probability theory. Due to its wide application in the field of maintenance of machinery and technical equipment, a Weibull model is proposed, and its possible practical applications are shown. A new method of expert elicitation of probabilities for any continuous random variable is developed. A general procedure for the application of this method is proposed and the individual steps of its implementation are discussed, as well as the mathematical models necessary for the estimation of the parameters of the probability distribution are presented. A practical example of the application of the developed method on specific numerical values is also presented.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 757-769
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concave and convex effects of ESG performance on corporate sustainable development: Evidence from China
Autorzy:
Zhang, XueHui
Miao, Le
Mu, Guoying
Wu, Kun-Shan
Powiązania:
https://bibliotekanauki.pl/articles/39992737.pdf
Data publikacji:
2024
Wydawca:
Instytut Badań Gospodarczych
Tematy:
ESG
corporate sustainable development
quantile regression
double-edged effect
Opis:
Research background: Corporate sustainable development (CSD) is essential to a company's success and survival. Environmental, social, and governance (ESG) are regarded as major factors in measuring the impact of CSD. Companies that perform well in terms of ESG can maintain a competitive advantage and achieve sustainable development. Poor management of ESG performance and involvement in controversial activity can harm a company's credibility and reputation in the market, as well as negatively impact sustainable development. Purpose of the article: Drawing on the stakeholder and signaling theories, this paper investigates the curvilinear nexus between ESG performance and CSD. Methods: Empirical studies were conducted on a sample of 697 Chinese listed manufacturing firms that disclosed ESG information from 2010 to 2020, with a total of 5699 firm-year observations. Quantile regression analysis and the U-test were used to examine the curvilinear ESG-CSD relationship. This technique was supplemented by conducting instrumental variables tests and propensity score matching to address concerns relating to the potential existence of endogeneity problems. Findings & value added: The results of the quantile regression estimation confirm the concave-convex (inverted U-shaped and U-shaped) ESG-CSD relationship via the U-test. The relationships between the environmental and social components and CSD follow an inverted U-shaped or half-inverted U-shaped pattern, while the relationship between the governance component and CSD exhibits a concave-convex pattern. A concave ESG-CSD nexus is evident in environmentally sensitive industries, whereas a half concave-convex ESG-CSD nexus is confirmed in non-environmentally sensitive industries. This study improves scholars’ understanding of ESG performance and provides a comprehensive perspective on the double-edged effects (positive and negative consequences) of ESG practices. The instrumentalization of ESG practices for management to seek personal gain has a negative impact on CSD, while ESG practices that add value for stakeholders have a positive impact. These findings provide empirical evidence for Chinese publicly listed manufacturing firms to effectively conduct ESG practices.
Źródło:
Oeconomia Copernicana; 2024, 15, 2; 595-636
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Quantile Regression In Analysis Of Healthy Life Years In The European Union Countries
Przestrzenna regresja kwantylowa w analizie długości życia w krajach Unii Europejskiej
Autorzy:
Trzpiot, Grażyna
Orwat-Acedańska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/633229.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
regresja kwantylowa
wieloraka kwantylowa autoregresja przestrzenna
analiza przestrzenna
długość życia w zdrowiu
quantile regression
multiple spatial quantile autoregression
spatial analysis
healthy life years
Opis:
Celem pracy jest badanie wpływu wybranych czynników na średnią długość życia z zdrowiu kobiet i mężczyzn w krajach UE. Ze względu na fakt, że kraje Unii Europejskiej charakteryzuje silne zróżnicowanie pod względem średniej długości życia w zdrowiu oraz jakości życia obywateli, stosujemy w pracy modele wielorakiej kwantylowej autoregresji przestrzennej. Regresja kwantylowa umożliwia analizę zależności pomiędzy zmiennymi w różnych kwantylach rozkładu zmiennej niezależnej. Ponadto narzędzie to jest odporne na założenie klasycznej regresji dotyczące postaci wielowymiarowego rozkładu składnika losowego. Estymacji punktowej parametrów modeli dokonano przy użyciu zmiennych instrumentalnych (Kim, Muller 2004), natomiast do estymacji przedziałowej i weryfikacji hipotezy istotności parametrów wykorzystano metodę bootstrap.
The paper investigates the impact of the selected factors on the healthy life years of men and women in the EU countries. The multiple quantile spatial autoregression models are used in order to account for substantial differences in the healthy life years and life quality across the EU members. Quantile regression allows studying dependencies between variables in different quantiles of the response distribution. Moreover, this statistical tool is robust against violations of the classical regression assumption about the distribution of the error term. Parameters of the models were estimated using instrumental variable method (Kim, Muller 2004), whereas the confidence intervals and p-values were bootstrapped.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2016, 19, 5; 179-199
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On monotone dependence functions of the quantile type
Autorzy:
Krajka, Andrzej
Szynal, Dominik
Powiązania:
https://bibliotekanauki.pl/articles/1340380.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
associated random variables
quantile monotone dependence function
mixture of distribution functions
quantile
independent
positively (negatively) quadrant dependent random variables
monotone dependence function
Opis:
We introduce the concept of monotone dependence function of bivariate distributions without moment conditions. Our concept gives, among other things, a characterization of independent and positively (negatively) quadrant dependent random variables.
Źródło:
Applicationes Mathematicae; 1995-1996, 23, 1; 51-72
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Has the pandemic changed the relationships between fintechs and banks?
Autorzy:
Będowska-Sójka, Barbara
Kliber, Agata
Laidroo, Laivi
Powiązania:
https://bibliotekanauki.pl/articles/27315315.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fintech
banks
COVID-19
cumulative return
MGARCH model
quantile coherency
Opis:
We examine the impact of COVID-19 on the banking and fintech sectors based on the relationships of the respective stock indices from December 2017 to April 2022. We analyse dynamic correlations within multivariate GARCH models and relationships in tails with the quantile coherency approach. Returns of fintech and banks dropped simultaneously at the beginning of the pandemic, but the analysis of cumulative returns and draw-downs reveals that the former recovered faster. Banks and fintechs experienced sharp declines together and fintech experienced extreme growth during the downfalls in the banking sector. However, the latter relationship disappears when we analyze only the banks from the USA and Eurozone. Thus, integrating with fintech may be especially beneficial for banks outside those regions. The ability of fintech to resurface and continue to grow demonstrates its importance in the financial system and confirms the shift toward a digital economy in financial markets.
Źródło:
Operations Research and Decisions; 2023, 33, 4; 15--33
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hedging of Equity-Linked Contract With a Maximal Success Factor
Zabezpieczenie kontraktu typu equity-linked z maksymalnym współczynnikiem sukcesu
Autorzy:
Klusik, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1932358.pdf
Data publikacji:
2021
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
quantile hedging
equity-linked contract
hedging kwantylowy
kontrakty equity-linked
Opis:
The author considers an equity-linked contract whose payoff depends on the lifetime of the policy holder and the stock price, and assumes the limited capital for hedging and provides the best strategy for an insurance company in the meaning of the so-called success factor ℙ[{≥} + {<} ], where denotes the end value of the strategy and D is the payoff of the contract. The study is a generalisation of the work by Föllmer and Schied (2004), and Klusik and Palmowski (2011), but it considers the much more general ‘incompleteness’ of the market, among others, midterm nonmarket information signals and infinite nonmarket scenarios.
W artykule opisano ubezpieczenie typu equity-linked, którego wypłata zależy od czasu życia ubezpieczonego oraz kursu akcji. Autor zakłada ograniczony kapitał zakładu ubezpieczeń na jego zabezpieczenie i pokazuje najlepszą strategię dla zakładu ubezpieczeń w sensie tzw. współczynnika sukcesu ℙ[{≥} + {<} ], gdzie oznacza końcową wartość strategii, a D jest wypłatą z kontraktu. Publikacja jest uogólnieniem prac (Föllmer i Schied, 2004; Klusik i Palmowski, 2011), ale rozważa dużo bardziej ogólną ‘niezupełność’ rynku, między innymi dopuszcza bieżący dopływ informacji w trakcie życia instrumentu oraz nieskończoną liczbę scenariuszy w odniesieniu do świata „pozarynkowego”.
Źródło:
Śląski Przegląd Statystyczny; 2020, 19 (25); 31-39
1644-6739
Pojawia się w:
Śląski Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of private capital flows on economic growth in the MENA region
Autorzy:
Ben-Salha, Ousama
Zmami, Mourad
Powiązania:
https://bibliotekanauki.pl/articles/1837956.pdf
Data publikacji:
2020-09-30
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
private capital flows
economic growth
MENA
fixed effect panel quantile
Opis:
The aim of the article is to conduct an empirical analysis of the impact of aggregate and disaggregate private capital flows on economic growth in eleven MENA countries between 1980 and 2018. Unlike prior empirical studies, the fixed effect panel quantile approach developed by Canay (2011) is implemented. Findings suggest that there is a significant difference in the effects of private capital flows on economic growth across lower and higher quantiles. More specifically, the effects of total private capital flows, foreign direct investment flows, portfolio flows and debt flows are positive and statistically significant only for low and medium quantiles, indicating that the enhancing impact of private capital flows in terms of economic growth is only confirmed in countries with relatively low and medium growth rates. Moreover, debt flows affect economic growth in countries recording high growth rates, stressing the importance of financial development in routing those flows into the most productive projects in the economy.
Źródło:
Economics and Business Review; 2020, 6, 3; 45-67
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
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