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Wyszukujesz frazę "quantile function" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych
Stand density and self-thinning dynamics in young birch stands on post-agricultural lands
Autorzy:
Socha, J.
Zasada, M.
Powiązania:
https://bibliotekanauki.pl/articles/991052.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
grunty porolne
uprawy lesne
drzewostany brzozowe
drzewostany mlode
zageszczenie drzew
wydzielanie sie drzew
self−thinning
silver birch
abandoned farmlands
stochastic frontier function
quantile regression
Opis:
The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), stochastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quantile. SFF was found to be the most adequate method for modeling maximum density.
Źródło:
Sylwan; 2014, 158, 05; 340-351
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tail orderings and the total time on test transform
Autorzy:
Bartoszewicz, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1339294.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
partial orderings
outliers
spacings
goodness-of-fit test
density-quantile function
Opis:
The paper presents some connections between two tail orderings of distributions and the total time on test transform. The procedure for testing the pure-tail ordering is proposed.
Źródło:
Applicationes Mathematicae; 1996-1997, 24, 1; 77-86
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small area quantile estimation based on distribution function using linear mixed models
Autorzy:
Stachurski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1837916.pdf
Data publikacji:
2021-06-30
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
quantile
distribution function
small area estimation
survey sampling
linear mixed model
Monte Carlo simulation
Opis:
In economic studies researchers are oeftn interested in the estimation of the distribution function or certain functions of the distribution function such as quantiles. This work focuses on the estimation quantiles as inverses of the estimates of the distribution function in the presence of auxiliary information that is correlated with the study variable. In the paper a plug-in estimator of the distribution function is proposed which is used to obtain quantiles in the population and in the small areas. Performance of the proposed method is compared with other estimators of the distribution function and quantiles using the simulation study. The obtained results show that the proposed method usually has smaller relative biases and relative RMSE comparing to other methods of obtaining quantiles based on inverting the distribution function.
Źródło:
Economics and Business Review; 2021, 7, 2; 97-114
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantile analysis of the operating costs of the public transport fleet
Autorzy:
Andrzejczak, K.
Selech, J.
Powiązania:
https://bibliotekanauki.pl/articles/374621.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
cost analysis
public transport
quantile function
analiza kosztów
transport publiczny
funkcja kwantylowa
Opis:
The aim of this paper is to develop a quantile method of cost analysis allowing identification of the most cost-generating malfunctions occurring in a fleet of public transport vehicles. The exemplification of this method has been performed for a fleet of a specified type of trams. The idea behind the quantile method of public transport vehicle operating cost analysis is the reversing of the accumulated function of costs, for the determination of which a cost database from a given operating time of a public transport vehicle fleet has been used. The paper presents data on the malfunctions from the first five years of operation of trams in a large transport company. The assumed time of five years results from the warranty period provided by the manufacturer. The recorded number of indexes of replaced parts was 547. The group contained inoperative parts that were renewed several times.
Źródło:
Transport Problems; 2017, 12, 3; 103-111
1896-0596
2300-861X
Pojawia się w:
Transport Problems
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:
New polynomial exponential distribution: properties and applications
Autorzy:
Beghriche, Abdelfateh
Zeghdoudi, Halim
Raman, Vinoth
Chouia, Sarra
Powiązania:
https://bibliotekanauki.pl/articles/2108330.pdf
Data publikacji:
2022-09-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
exponential distribution
Xgamma distribution
Lindley distribution
quantile function stochastic ordering
maximum-likelihood estimation
XLindley distribution
Opis:
The study describes the general concept of the XLindley distribution. Forms of density and hazard rate functions are investigated. Moreover, precise formulations for several numerical properties of distributions are derived. Extreme order statistics are established using stochastic ordering, the moment method, the maximum likelihood estimation, entropies and the limiting distribution. We demonstrate the new family's adaptability by applying it to a variety of real-world datasets.
Źródło:
Statistics in Transition new series; 2022, 23, 3; 95-112
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended Lognormal Distribution: Properties and Applications
Autorzy:
Lahcene, Bachioua
Powiązania:
https://bibliotekanauki.pl/articles/1030771.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Characteristics and Survival Function
Generating and Quantile Functions
Hazard Rate Function
Lognormal Distribution
Mixture
Model
Opis:
This paper is devoted to study a form of lognormal distributions family and introduce some of its basic properties. It presents new derivate models that find many applications will be useful for practitioners in various fields. The abstract explores some of the basic characteristics of the family of abnormal distributions and provides some practical methods for analyzing some different applied fields related to theoretical and applied statistical sciences. The proposed model allows for the improvement of the relevance of near-real data and opens broad horizons for the study of phenomena that can be addressed through the results obtained. This study is devoted to a review of fitting data, discuss distribution laws for models and describe the approaches used for parameterization and classification of models. Finally, a set of concluding observations has been developed to track the mix distributions and their adaptation mechanisms.
Źródło:
World Scientific News; 2020, 145; 16-30
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants of farm income in the European Union in new and old member states. A regional study
Determinanty dochodów gospodarstw rolnych w Unii Europejskiej z uwzględnieniem kryterium stażu członkowskiego. Analiza regionalna
Autorzy:
Kryszak, L.
Matuszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1790453.pdf
Data publikacji:
2019
Wydawca:
The Polish Association of Agricultural and Agribusiness Economists
Tematy:
agricultural income
European Union
Cobb-Douglas function
quantile panel regression
dochody rolnicze
Unia Europejska
funkcja Cobba-Douglasa
panelowa regresja kwantylowa
Opis:
The aim of the article was to identify the determinants of income of representative farms at the level of European Union regions. For this purpose, FADN data was used for the years 2004-2017. Due to varied conditions of agricultural development, EU regions were divided into groups according to seniority of members. Income was examined using basic panel regression and quantile panel regression models using the extended Cobb-Douglas formula. Apart from the basic input of production factors (labour, capital and land), the impact of subsidies as well as production and financial management strategies in the farms were also investigated. It was found that farm income in so-called new member states were more sensitive to growing specialization, direct payments and capital expenditure, while, in the so-called old EU, there was a relatively high elasticity of income in relation to the labour factor. On the other hand, income was negatively affected by an increase in the level of financial leverage. The results of the quantile regression model show that, with increasing farm income, the role of labour and land factors decreases, while the significance of the capital factor remains relatively constant.
Celem artykułu jest identyfikacja determinant dochodów reprezentatywnych gospodarstw rolnych na poziomie regionów Unii Europejskiej. W tym celu posłużono się danymi FADN za lata 2004-2017. Ze względu na odmienne uwarunkowania rozwoju rolnictwa dokonano podziału regionów Unii Europejskiej według kryterium stażu członkowskiego. Dochody badano za pomocą regresji panelowej i kwantylowej regresji panelowej z wykorzystaniem rozszerzonej formuły Cobba-Douglasa. Oprócz podstawowych nakładów czynników produkcji (pracy, kapitału i ziemi) badano również wpływ subsydiów oraz strategii zarządzania produkcją i finansami w gospodarstwie rolnym. Ustalono, że dochody gospodarstw w tzw. nowych krajach członkowskich w większym stopniu były wrażliwe na rosnącą specjalizację, płatności bezpośrednie oraz nakłady kapitałowe. W krajach tzw. starej Unii Europejskiej odnotowano względnie wysoką elastyczność dochodów względem czynnika pracy. Natomiast ujemny wpływ na dochód miał wzrost poziomu wykorzystania nakładów obcych. Wyniki modelu regresji kwantylowej pokazują, że wraz ze wzrostem dochodów gospodarstwa rola czynników pracy i ziemi zmniejsza się, podczas gdy znaczenie czynnika kapitałowego jest względnie stałe.
Źródło:
Annals of The Polish Association of Agricultural and Agribusiness Economists; 2019, 21, 3; 200-211
2657-781X
2657-7828
Pojawia się w:
Annals of The Polish Association of Agricultural and Agribusiness Economists
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
    Wyświetlanie 1-9 z 9

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