Temat: variance - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A note on conditional variance and characterization of probability distributions
Autorzy:: Jaworski, Piotr
Pitera, Marcin
Opis:: In this note we prove a novel characterization result stating that any distribution is determined uniquely up to an additive constant by its conditional variance function where the conditioning is based on double quantile trimming. We also outline potential statistical applications of the proposed characterization.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Goodness-of-fit test for a-stable distribution based on the quantile conditional variance statistics
Autorzy:: Chechkin, Aleksei
Pitera, Marcin
Wyłomaśka, Agnieszka
Opis:: The class of α-stable distributions is ubiquitous in many areas including signal processing, finance, biology, physics, and condition monitoring. In particular, it allows efficient noise modeling and incorporates distributional properties such as asymmetry and heavy-tails. Despite the popularity of this modeling choice, most statistical goodness-of-fit tests designed for α-stable distributions are based on a generic distance measurement methods. To be efficient, those methods require large sample sizes and often do not efficiently discriminate distributions when the corresponding α-stable parameters are close to each other. In this paper, we propose a novel goodness-of-fit method based on quantile (trimmed) conditional variances that is designed to overcome these deficiencies and outperforms many benchmark testing procedures. The effectiveness of the proposed approach is illustrated using extensive simulation study with focus set on the symmetric case. For completeness, an empirical example linked to plasma physics is provided.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: THE ANALYSIS OF UNEMPLOYMENT VARIATION MEASURES IN THE EU MEMBER STATES
Autorzy:: Borawski, Mariusz
Tematy:: unemployment
pseudo-variance; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Powiązania:: https://bibliotekanauki.pl/articles/453756.pdf Link otwiera się w nowym oknie
Opis:: The issue of unemployment may be examined from many aspects. It is not only unemployment rate itself, but also the distribution of unemployment in a given country that are of major importance. To conduct such research, it is necessary to analyze measures of unemployment variation. The article presents unemployment variation measures together with their unique character.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Jackknife winsorized variance estimator under imputed data
Autorzy:: Sohil, Fariha
Sohail, Muhammad Umair
Shabbir, Javid
Gupta, Sat
Tematy:: adjusted imputation
jackknife variance estimators
linearized jackknife
missing values
winsorized variance; Pokaż więcej
Wydawca:: Główny Urząd Statystyczny
Powiązania:: https://bibliotekanauki.pl/articles/2106879.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Formulation of estimator for population mean in stratified successive sampling using memory-based information
Autorzy:: Majumder, Sanjoy
Bandyopadhyay, Arnab
Gupta, Arindam
Tematy:: successive sampling
HEWMA
regression estimator
variance
minimum variance
efficiency; Pokaż więcej
Wydawca:: Główny Urząd Statystyczny
Powiązania:: https://bibliotekanauki.pl/articles/61791517.pdf Link otwiera się w nowym oknie
Opis:: In study described in this article, we developed a memory type estimator for the population mean in stratified successive sampling. We used the past sample information together with the current sample information through hybrid exponentially weighted moving averages statistics. We have also used the information available on auxiliary variable to construct the proposed estimator. We studied the properties of the proposed estimator. Further, we examined the performance of the proposed estimator in comparison with conventional estimator of the population mean and the results are demonstrated by using the data set of simulation as well as natural population. After observing the auspicious findings, we suggest that the proposed estimator can be applied to solve real-life problems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Variability of Household Disposable Income Per Capita by Types of Residence in Poland
Autorzy:: Turczak, Anna
Zwiech, Patrycja
Tematy:: disposable income per capita
type of residence
within-group variance
between-group variance; Pokaż więcej
Wydawca:: Główny Urząd Statystyczny
Powiązania:: https://bibliotekanauki.pl/articles/465896.pdf Link otwiera się w nowym oknie
Opis:: The dispersion of household disposable income per capita in each class of residence (i.e. six) was estimated for households in Poland. Then, the dispersion of income between the classes was analysed. The computation was carried out separately for subsequent years from 1998 to 2012. The study shows that the households in Poland are differentiated with regard to income per capita by types of residence, however, the differences within the groups are much bigger than the differences between the groups. What is particularly surprising, the share of between-group variance in total variance in the population under study was negligible small (just a few percent) compared to the share of the mean within-group variance (more than 90 percent).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Przysłówki limitatywne typu z całej siły, na cały głos
Limitive adverbs of the type z całej siły, na cały głos
Autorzy:: Kubicka, Emilia
Tematy:: adverbs
limitation
force
phraseological variance; Pokaż więcej
Wydawca:: Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Powiązania:: https://bibliotekanauki.pl/articles/568237.pdf Link otwiera się w nowym oknie
Opis:: The described units concern the limits and the force using in different ways. The unit z całej siły 'all out' comments only on physical actions and it is not important whether they are intentional or not. The adverb ze wszystkich sił 'with all forces' however, is always connected with AIM and it is not important whether the limits were reached with the use of physical forces or not. For using the adverb ile sił (ile sił w_) 'all out', the animate agent must have used his maximal physical force which set in motion these parts of his body which were responsible for that kind of action. The adverbs na cały głos and na całe gardło 'at the top of one's voice' comment on emitting sounds, the second one cannot be related to speaking.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: On the Distribution of Quadratic Form of Sample Mean and Variance
O rozkładzie formy kwadratowej średniej i wariancji z próby
Autorzy:: Wywiał, Janusz
Kończak, Grzegorz
Tematy:: quadratic form
mean
variance
distribution; Pokaż więcej
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Powiązania:: https://bibliotekanauki.pl/articles/905703.pdf Link otwiera się w nowym oknie
Opis:: The quadratic form of the sample mean and sample variance was considered. The sample is from normal distribution. The density function of the quadratic form has been derived. The quadratic form can be applied as the test statistic for the hypothesis on expected value and variance of normal distribution. The table with approximated critical values of the test statistic has been derived.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Approximate sums of squares in analysis of variance
Autorzy:: Stępniak, Czesław
Tematy:: Analysis of variance and covariance; Pokaż więcej
Wydawca:: Polskie Towarzystwo Matematyczne
Powiązania:: https://bibliotekanauki.pl/articles/747994.pdf Link otwiera się w nowym oknie
Opis:: .
Consider the two-way crossed classification model, in which there are a levels of the factor A, b levels of the factor B and nij observations y(i,j,k), k=1,⋯,n(i,j), for the (i,j)th cell, i=1,⋯,a, j=1,⋯,b. The sum of squares for testing interactions in this model can be written as Q=∑(i,j)n(i,j)(y(i,j,⋅)/n(i,j)−y(i,⋅,⋅)/n(i,⋅)−y(⋅,j,⋅)/n(j,⋅)+y(⋅,⋅,⋅)/n(⋅,⋅))^2, where y(i,j,⋅)=∑(k)y(i,j,k), y(i,⋅,⋅)=∑(j)y(i,j,⋅), y(⋅,j,⋅)=∑(i)y(i,j,⋅), y(⋅,⋅,⋅)=∑(i)y(i,⋅,⋅), n(i,⋅)=∑(j)n(i,j), n(⋅,j)=∑(i)n(i,j) and n(⋅,⋅)=∑(i)n(i,⋅). It is well known that if the numbers of observations are proportional, i.e., if (1) n(i,j)=n(i,⋅)n(⋅,j)/n(⋅,⋅) for all i=1,⋯,a and j=1,⋯,b, then the quadratic form Q(0)=∑(i,j)y(i,j,⋅)^2/n(i,j)−∑(i)y(i,⋅,⋅)^2/n(i,⋅)−∑(j)y^2(⋅,j,⋅)/n(⋅,j)+y^2(⋅,⋅,⋅)/n(⋅,⋅) is nonnegative definite, being then identical with Q. The author proves the converse of this implication; he shows that the nonnegative definiteness of Q0 implies the proportionality condition (1). He considers a similar problem also for the case of the three-way crossed classification model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Quadratic estimation of variance components in linear models
Autorzy:: Gnot, Stanisław
Tematy:: Analysis of variance and covariance; Pokaż więcej
Wydawca:: Polskie Towarzystwo Matematyczne
Powiązania:: https://bibliotekanauki.pl/articles/748358.pdf Link otwiera się w nowym oknie
Opis:: .
In the paper the theory of quadratic estimation of variance components in linear models and its applications are presented. In the presentation of the theory the coordinate-free approach is used. The applications concern estimation of variance components in general linear regression model and its special cases. The problem of admissibility of quadratic estimates in mixed linear models with two variance components is considered separately.
Dostawca treści:: Biblioteka Nauki

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