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Wyświetlanie 1-15 z 248
Tytuł:
A GIS Procedure to Assess Shoreline Changes over Time Using Multi-temporal Maps: An Analysis of a Sandy Shoreline in Southern Italy over the Last 100 Years
Autorzy:
Pepe, Massimiliano
Costantino, Domenica
Alfio, Vincenzo Saverio
Powiązania:
https://bibliotekanauki.pl/articles/2203960.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
GIS
variance
georeferencing
Google Earth Pro
DSAS
shoreline
Opis:
The aim of the paper is to identify a methodology capable of assessing shoreline changes through a geomatic approach based on the use of GIS (Geographic Information System) software. The paper describes a case study that reports the evolution of a coastline over a period of more than 100 years using medium and large-scale metric maps available in different periods. In fact, the coastlines were obtained from the source maps of the Italian Cadastre (dated 1890), from numerical cartography available on the coastline and acquired in different period at scales 1:5000 and 1:2000 and, more recently, from the Google Earth Pro platform. To analyse the evolution of the coastline a new procedure has been performed which is based on the use of GIS software, in particular a plugin called DSAS that allows the evaluation of the changes in the coastline and also obtains a statistical analysis of its evolution. The results showed the ease and applicability of the method in determining the evolution of the coastline and the strong erosion of a stretch of coastline with important socio-economic consequences and repercussions was highlighted in the analysed case study.
Źródło:
Geomatics and Environmental Engineering; 2023, 17, 3; 107--134
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advances in estimation by the item sum technique in two move successive sampling
Autorzy:
Priyanka, Kumari
Trisandhya, Pidugu
Powiązania:
https://bibliotekanauki.pl/articles/19900669.pdf
Data publikacji:
2023-09-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
Sensitive variable
Successive moves
Population mean
Variance
Mean squared error
Optimum matching fraction
Opis:
The present article proposes an estimator using the Item Sum Technique (IST) for the estimation of dynamic sensitive population mean using non-sensitive auxiliary information in the two-move successive sampling. Properties of the proposed IST estimator have been analysed. Possible allocation designs for allocating long-list and short-list samples pertaining to the IST have been elaborated. The comparison between various allocation designs has been carried out. Theoretical considerations have been integrated with numerical as well as simulation studies to show the working version of the proposed IST estimators in the two-move successive sampling.
Źródło:
Statistics in Transition new series; 2023, 24, 4; 123-138
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An empirical study of hierarchical Bayes small area estimators using different priors for model variances
Autorzy:
You, Yong
Powiązania:
https://bibliotekanauki.pl/articles/19938261.pdf
Data publikacji:
2023-09-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
CPO
flat prior
inverse gamma prior
relative error
variance component
Opis:
In this paper, we study hierarchical Bayes (HB) estimators based on different priors for small area estimation. In particular, we use inverse gamma and flat priors for variance components in the HB small area models of You and Chapman (2006) and You (2021). We evaluate the HB estimators through a simulation study and real data analysis. Our results indicate that using the inverse gamma prior for the variance components in the HB models can be very effective.
Źródło:
Statistics in Transition new series; 2023, 24, 4; 169-178
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Stability the Chemical Composition of Slags
Autorzy:
Sitko, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/27314160.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
slag
chemical composition
variance
coefficient of variation
assessment of stability
żużel
skład chemiczny
współczynnik zmienności
ocena stabilności
Opis:
Metallurgical slags are an object of the increasing interest in terms of the possibility of their utilization, especially as materials used in the construction and road building industries, in the foundry industry for refining and purifying liquid alloys, the production of abrasives for surface treatment of remanufactured machine parts, as mine backfill materials. Metallurgical slags, in order to be used in foundry processes, should be characterized by the stability of the chemical composition. This paper presents the results of statistical analysis calculations, in which using a specific group f samples, knowing their chemical composition, the mean value Ā, variance Ϭ2, standard deviation Ϭ and the classical coefficient of variation V were determined. The research and its results report the amount of variation in considered components of the slags.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 145--150
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Correlation between Random Variables and their Principal Components
Autorzy:
Gniazdowski, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/14115826.pdf
Data publikacji:
2023-09
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
correlation
random components
principal components
factors
common variance
Opis:
The article attempts to find an algebraic formula describing the correlation coefficients between random variables and the principal components representing them. As a result of the analysis, starting from selected statistics relating to individual random variables, the equivalents of these statistics relating to a set of random variables were presented in the language of linear algebra, using the concepts of vector and matrix. This made it possible, in subsequent steps, to derive the expected formula. The formula found is identical to the formula used in Factor Analysis to calculate factor loadings. The discussion showed that it is possible to apply this formula to optimize the number of principal components in Principal Component Analysis, as well as to optimize the number of factors in Factor Analysis.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2023, 17, 28; 41-55
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of returns and variance and the implications for time series modelling: Evidence from South Africa
Autorzy:
Szczygielski, Jan Jakub
Chipeta, Chimwemwe
Powiązania:
https://bibliotekanauki.pl/articles/23942749.pdf
Data publikacji:
2023-08-11
Wydawca:
Fundacja Naukowa Instytut Współczesnych Finansów
Tematy:
Johannesburg Stock Exchange
leverage effect
stock market returns
variance
Opis:
This paper investigates the properties of South African stock returns and the underlying variance. The investigation into the properties of stock returns and the behaviour of the variance underlying returns is undertaken using model-free approaches and through the application of ARCH/GARCH models. The results indicate that, as with other stock markets, returns on the South African stock market depart from normality and that variance displays evidence of heteroscedasticity, long memory, persistence, and asymmetry. Applying the EGARCH(p,q,m) and IGARCH(p,q) specifications confirms these findings and the application of these models suggests differing characteristics for variance structures underlying the South African stock market. In light of the findings relating to the properties of stock returns and the characteristics of variance and its structure, implications are outlined, and recommendations on how time-series specifications may be estimated are made.
Źródło:
Modern Finance; 2023, 1, 1; 35-55
2956-7742
Pojawia się w:
Modern Finance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Preschool Education Experience on Multidimensional Non-Cognitive Abilities and Personality Development of Adolescents
Autorzy:
Zhang, Guohui
Chayanuvata, Anchalee
Powiązania:
https://bibliotekanauki.pl/articles/2191740.pdf
Data publikacji:
2023-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
preschool education
non-cognitive skills
personality development
analysis of variance (ANOVA)
student’s t-test
Opis:
The topic’s relevance is based on solving the problems of the influence of preschool education experience on the multidimensional non-cognitive abilities and personality development of adolescents. The purpose of the article was to analyse the problems of the formation of multidimensional non-cognitive processes, substantiating and determining the non-cognitive abilities of preschool children: highly developed personality, giftedness, intelligence, soft skills and conducting an experiment using the basic survey of the 2013-2014 school years conducted by the Chinese Expert Research on Education (CEPS) at Renmin University (China). The methodological approach of the research was based on the methods of analysis, synthesis, comparison, generalisation of literary sources on the problem of researching the formation of multidimensional non-cognitive abilities, graphic methods for visual illustration and comparison of the results of the ascertaining and formative stages of the research. The content of the main concepts of “abilities” and “non-cognitive abilities” is determined, and their features and features are revealed. The identified non-cognitive abilities and their indicators, as well as the methods of their formation, can be used as methodical material for universities and for the personal development of individual preschool education specialists in near and far foreign countries.
Źródło:
The New Educational Review; 2023, 71; 101-113
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of confidence intervals for variance components in an unbalanced one-way random effects model
Autorzy:
Jiratampradab, Arisa
Supapakorn, Thidaporn
Suntornchost, Jiraphan
Powiązania:
https://bibliotekanauki.pl/articles/2156992.pdf
Data publikacji:
2022-12-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
variance components
unbalanced one-way random effects model
pivotal quantity
fiducial inference
coverage probability
Opis:
The purpose of this paper is to study and compare the methods for constructing confidence intervals for variance components in an unbalanced one-way random effects model. The methods are based on a classical exact, generalised pivotal quantity, a fiducial inference and a fiducial generalised pivotal quantity. The comparison of criteria involves the empirical coverage probability that maintains at the nominal confidence level of 0.95 and the shortest average length of the confidence interval. The simulation results show that the method based on the generalised pivotal quantity and the fiducial inference perform very well in terms of both the empirical coverage probability and the average length of the confidence interval. The classical exact method performs well in some situations, while the fiducial generalised pivotal quantity performs well in a very unbalanced design. Therefore, the method based on the generalised pivotal quantity is recommended for all situations.
Źródło:
Statistics in Transition new series; 2022, 23, 4; 149-160
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating the confidence interval of the regression coefficient of the blood sugar model through a multivariable linear spline with known variance
Autorzy:
Islamiyati, Anna
Raupong, Raupong
Kalondeng, Anisa
Sari, Ummi
Powiązania:
https://bibliotekanauki.pl/articles/2019723.pdf
Data publikacji:
2022-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
confidence interval
diabetes
known variance
spline
Opis:
Estimates from confidence intervals are more powerful than point estimates, because there are intervals for parameter values used to estimate populations. In relation to global conditions, involving issues such as type 2 diabetes mellitus, it is very difficult to make estimations limited to one point only. Therefore, in this article, we estimate confidence intervals in a truncated spline model for type 2 diabetes data. We use a non-parametric regression model through a multi-variable spline linear estimator. The use of the model results from the irregularity of the data, so it does not form a parametric pattern. Subsequently, we obtained the interval from beta parameter values for each predictor. Body mass index, HDL cholesterol, LDL cholesterol and triglycerides all have two regression coefficients at different intervals as the number of the found optimal knot points is one. This value is the interval for multivariable spline regression coefficients that can occur in a population of type 2 diabetes patients.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 201-212
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimating the population mean using a complex sampling design dependent on an auxiliary variable
Autorzy:
Chaudhuri, Arijit
Samaddar, Sonakhya
Powiązania:
https://bibliotekanauki.pl/articles/2034118.pdf
Data publikacji:
2022-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
Des Raj and symmetrized Des Raj estimator and associated variance
Hartley-Ross
Horvitz-Thompson
Lahiri-Midzuno-Sen
Murthy
Rao-Hartley-Cochran procedures vis-a-vis SRSWOR and SRSWR
Hansen-Hurwitz estimation and variance
Opis:
In surveying finite populations, the simplest strategy to estimate a population total without bias is to employ Simple Random Sampling (SRS) with replacement (SRSWR) and the expansion estimator based on it. Anything other than that including SRS Without Replacement (SRSWOR) and usage of the expansion estimator is a complex strategy. We examine here (1) if from a complex sample at hand a gain in efficiency may be unbiasedly estimated comparing the ”rival population total-estimators” for the competing strategies and (2) how suitable model-expected variances of rival estimators compete in magnitude as examined numerically through simulations.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 39-54
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of P(X ≤ Y ) for discrete distributions with non-identical support
Autorzy:
Mouli Choudhury, Mriganka
Bhattacharya, Rahul
Maiti, Sudhansu S.
Powiązania:
https://bibliotekanauki.pl/articles/2107147.pdf
Data publikacji:
2022-09-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
stress-strength model
uniformly minimum variance unbiased
maximum likelihood
Opis:
The Uniformly Minimum Variance Unbiased (UMVU) and the Maximum Likelihood (ML) estimations of R = P(X ≤ Y ) and the associated variance are considered for independent discrete random variables X and Y. Assuming a discrete uniform distribution for X and the distribution of Y as a member of the discrete one parameter exponential family of distributions, theoretical expressions of such quantities are derived. Similar expressions are obtained when X and Y interchange their roles and both variables are from the discrete uniform distribution. A simulation study is carried out to compare the estimators numerically. A real application based on demand-supply system data is provided.
Źródło:
Statistics in Transition new series; 2022, 23, 3; 43-64
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the production direction of European Union farms on the level of financial liabilities
Autorzy:
Firlej, Krzysztof
Kubala, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/27313689.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
agriculture
plant production
livestock production
FADN
analysis of variance
rolnictwo
produkcja roślinna
produkcja zwierzęca
analiza wariancji
Opis:
Purpose: The main purpose of the study was to investigate the relationship between the direction of production of farms in the European Union and the level of their liabilities. Design/methodology/approach: The study period includes the years 2005-2019. Data relating to eight types of farming identified in the FADN database were used to illustrate the directions of production. The conducted research focuses on the following types of liabilities: total, incurred for a period longer than one year and incurred for a period of less than one year with outstanding cash payments. One-way ANOVA variance was used to achieve the research objective. Findings: The conducted research showed that the most common differences in the level of liabilities are between the type of granivores and the types of farms focused on plant production and other permanent crops with farms focused on field crops, horticulture and livestock production. Relatively few differences can be observed in the case of farms targeting the same source of food origin (except for other permanent crops). Originality/value: The obtained results indicate a significant differentiation in the level of liabilities in farms focused on plant and livestock production, which results from the different specificity of their production.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 158; 163--173
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jackknife winsorized variance estimator under imputed data
Autorzy:
Sohil, Fariha
Sohail, Muhammad Umair
Shabbir, Javid
Gupta, Sat
Powiązania:
https://bibliotekanauki.pl/articles/2106879.pdf
Data publikacji:
2022-06-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
adjusted imputation
jackknife variance estimators
linearized jackknife
missing values
winsorized variance
Opis:
In the present study, we consider the problem of missing and extreme values for the estimation of population variance. The presence of extreme values either in the study variable, or the auxiliary variable, or in both of them, can adversely affect the performance of the estimation procedure. We consider three different situations for the presence of extreme values and also consider jackknife variance estimators for the population variance by handling these extreme values under stratified random sampling. Bootstrap technique ABB is carried out to understand the relative relationship more precisely.
Źródło:
Statistics in Transition new series; 2022, 23, 2; 17-32
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Różnice w podejściach do badania zaufania międzyorganizacyjnego w literaturze polskojęzycznej i anglojęzycznej
Different approaches to studying inter-organisational trust relations in Polish and English literature
Autorzy:
Staszek vel Staszewski, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2130149.pdf
Data publikacji:
2022-09-30
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
zaufanie
relacje międzyorganizacyjne
zaufanie międzyorganizacyjne
teoria procesu
teoria wariancji
trust
inter-organisational relations
inter-organisational trust
process theory
variance theory
Opis:
W ostatnich latach, zarówno w literaturze polskiej jak i międzynarodowej, rośnie liczba badań poświęconych tematyce zaufania w relacjach międzyorganizacyjnych. Stosowane są dwa podejścia metodologiczne: teoria wariancji lub teoria procesu. Celem artykułu jest porównanie dorobku polskiego i międzynarodowego pod względem dominujących w badaniach podejść metodologicznych. Niniejszy artykuł przygotowano, opierając się na systematycznym przeglądzie literatury na temat zaufania międzyorganizacyjnego. Publikacje gromadzono z użyciem słów kluczowych i metodyki kuli śnieżnej. Selekcji dokonano na podstawie abstraktów oraz analizy treści wybranych artykułów. Zaprezentowano i porównano podejścia metodologiczne zastosowane w poszczególnych badaniach. Z puli 726 pozycji wybrano 32 artykuły polskojęzyczne oraz 30 artykułów anglojęzycznych i porównano ze sobą oba zbiory. Dane zaprezentowano w tabeli porównawczej. Wyniki wskazują na lukę badawczą w literaturze polskojęzycznej w postaci niedostatecznej liczby badań na temat zaufania na poziomie międzyorganizacyjnym w podejściu procesualnym. Zastosowanie tego podejścia potencjalnie pogłębiłoby zrozumienie relacji organizacji względem siebie, zwłaszcza w kontekście Polski.
In recent years both in Polish and international literature, the number of studies devoted to trust in inter-organisational relations has grown at a steady pace. The authors of these studies tend to apply two methodological approaches: variance theory and process theory. The aim of this article is to compare Polish and English language academic literature with regard to the methodological approaches. The article is based on a systematic literature review of inter-organisational trust, with literature collected based on keywords and snowball methodology. The election was based on abstract analysis and the text of selected articles. The methodologies of the selected articles were presented and compared. From the initial pool of 726 positions, 32 articles in Polish and 30 in English were analysed and compared, with the data presented in a comparison table. The findings indicate a research gap in Polish-language literature in the form of an insufficient amount of research on trust at inter-organisational level using a process-based approach. Applying this approach would potentially deepen the understanding of organisations' relationships with each other, especially in the context of Poland.
Źródło:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2022, 95, 3; 61-71
1731-6758
1731-7428
Pojawia się w:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variance estimation in stratified adaptive cluster sampling
Autorzy:
Yasmeen, Uzma
Noor-ul-Amin, Muhammad
Hanif, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2034098.pdf
Data publikacji:
2022
Wydawca:
Główny Urząd Statystyczny
Tematy:
variance estimator
stratified sampling
stratified adaptive cluster sampling (SACS)
Opis:
In many sampling surveys, the use of auxiliary information at either the design or estimation stage, or at both these stages is usual practice. Auxiliary information is commonly used to obtain improved designs and to achieve a high level of precision in the estimation of population density. Adaptive cluster sampling (ACS) was proposed to observe rare units with the purpose of obtaining highly precise estimations of rare and specially clustered populations in terms of least variances of the estimators. This sampling design proved to be more precise than its more conventional counterparts, including simple random sampling (SRS), stratified sampling, etc. In this paper, a generalised estimator is anticipated for a finite population variance with the use of information of an auxiliary variable under stratified adaptive cluster sampling (SACS). The bias and mean square error expressions of the recommended estimators are derived up to the first degree of approximation. A simulation study showed that the proposed estimators have the least estimated mean square error under the SACS technique in comparison to variance estimators in stratified sampling.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 173-184
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 248

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