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    Wyświetlanie 1-6 z 6
    Tytuł:
    On the Behrens-Fisher distribution and its generalization to the pairwise comparisons
    Autorzy:
    Witkovský, Viktor
    Powiązania:
    https://bibliotekanauki.pl/articles/729846.pdf
    Data publikacji:
    2002
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    Behrens-Fisher distribution
    pairwise comparisons
    unequal variances
    generalized p-values
    Opis:
    Weerahandi (1995b) suggested a generalization of the Fisher's solution of the Behrens-Fisher problem to the problem of multiple comparisons with unequal variances by the method of generalized p-values. In this paper, we present a brief outline of the Fisher's solution and its generalization as well as the methods to calculate the p-values required for deriving the conservative joint confidence interval estimates for the pairwise mean differences, refered to as the generalized Scheffé intervals. Further, we present the corresponding tables with critical values for simultaneous comparisons of the mean differences of up to k = 6 normal populations with unequal variances based on independent random samples with very small sample sizes.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2002, 22, 1-2; 73-104
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Common Trends and Common Cycles - Bayesian Approach
    Autorzy:
    Wróblewska, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2076539.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cointegration
    Bayesian analysis
    common cyclical features
    matrix Bingham-von Mises-Fisher distribution
    matrix Langevin-Bingham distribution
    Opis:
    In 1993 Engle and Kozicki proposed the notion of common features of which one example is a serial correlation common feature. We say that stationary, noninnovation processes exhibit common serial correlation when there exists at least one linear combination of them which is an innovation. Later on in 1993 Vahid and Engle combined the notions of cointegration among I(1) processes with common serial correlation within their first differences. It is commonly known that cointegrated time series have vector error correction (VEC) representation. The existence of common serial correlation leads to an additional reduced rank restriction imposed on the VEC model’s parameters. This type of restriction was later termed a strong form (SF) reduced rank structure, as opposed to a weak one introduced in 2006 by Hecq, Palm and Urbain. The main aim of the present paper is to construct the Bayesian vector error correction model with these additional strong form restrictions. The empirical validity of investigating both the short- and long-run comovements between macroeconomic time series will be illustrated by the analysis of the price-wage nexus in the Polish economy.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2015, 2; 91-110
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship causalities – reasons and statistical analyze
    Autorzy:
    Denev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201330.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    safety at sea
    ship causaliries
    statistical analysis
    World Ocean
    ship accidents
    damage
    fisher distribution
    ships damages
    Opis:
    The paper deals with most recently damages caused ship accidents and their number in the World Ocean. A lot of them are a result of bad technical condition or human mistake. The first reason is due to ship age, non- qualitative maintenance and non- qualitative repair of ship hull thought its life cycle, while the second reason is mainly of labour safety neglect. Analyzed period covers 27 years, from 1994 up to 2021. The analyze is done for two ships group- merchant and special ships. The paper described damages on ship hull and its structural members caused ship accidents and environmental pollution in relation with age of ships. The number and degree of marine causalities are analyzed. Moreover, statistical analysis presents the often causalities and areas in the World Ocean by ship and damage types. Finally, probabilistic density distributions of damages were shown by Fisher distribution curve. The damages on Fisher distribution curve are presented independent one another.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 4; 607--610
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostic information analysis of quickly changing temperature of exhaust gas from marine diesel engine. Part i single factor analysis
    Autorzy:
    Puzdrowska, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/2033280.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine diesel engine
    exhaust gas temperature
    diagnostic information
    F-statistic of Fisher-Snedecor distribution
    Opis:
    In this paper, attention was paid to the problem of low controllability of marine medium- and high-speed engines during operation, which significantly limits the parametric diagnosis. The measurement of quickly changing temperature of engine exhaust gas was proposed, the courses of which can be a source of diagnostic information. The F statistic of the Fisher-Snedecor distribution was chosen as a statistical tool. Laboratory tests were carried out on the bench of a Farymann Diesel engine. The tests consisted of introducing the real changes in the constructional structure of the considered functional systems of the engine. Three changed parameters for the structure were reviewed: the active cross-sectional area of the inlet air channel, injector opening pressure and compression ratio. Based on the recorded plots of the quick-changing temperatures of the exhaust gases, three diagnostic measures were defined and subjected to statistical tests. The following data were averaged over one cycle for a 4-stroke piston engine operation, (1) the peakto-peak value of the exhaust gas temperature, (2) the specific enthalpy of the exhaust gas, and (3) the rate of increase and decrease in the values for the quick-changing exhaust gas temperature. In this paper will present results of the first stage of the elimination study: the one-factor statistical analysis (randomised complete plan). The next part will present the results of the second stage of studies: two-factor analysis (block randomised plan), where the significance of the effect of changing the values of the structure parameters on the diagnostic measures was analysed in the background of a variable engine load.
    Źródło:
    Polish Maritime Research; 2021, 4; 97-106
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostic analysis of exhaust gas with a quickchanging temperature from a marine diesel engine part II / two factor analysis
    Autorzy:
    Puzdrowska, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/34616318.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine diesel engine
    exhaust gas temperature
    diagnostic information
    F-statistic of Fisher-Snedecor distribution
    Opis:
    The article presents a continuation of research carried out to determine the effect of input parameters (changes in engine structure parameters) on selected output parameters (diagnostic measures), based on quickly changing exhaust gas temperature. A method of determining the simultaneous influence of two input factors (the structure parameter and the engine load) on one output factor was presented, as well as an evaluation of which of the analysed input factors has a stronger influence on the output parameter. The article presents the stages of the experimental research conducted and statistical inference based on the results. Three changing parameters for the structure were reviewed: the active cross-sectional area of the inlet air channel, the injector opening pressure and the compression ratio. Based on the quickly changing temperatures of the exhaust gases, three diagnostic measures were defined and subjected to statistical tests. The following data were averaged over one cycle for a 4-stroke engine operation: the intensity of changes, the specific enthalpy and the peak-to-peak value of the exhaust gas temperature. The results of the two-factor analysis are presented. Conclusions on the analysis are given and a criterion for the selection of a diagnostic measure, depending on the analysed parameter of the structural design of the diesel engine, is proposed. The previous part of the article presented the results of the first stage of the elimination study: the one-factor statistical analysis (randomised complete plan). This paper presents the results of the second stage of the studies: two-factor analysis (block randomised plan), where the significance of the effect of changing the values of the structural parameters on the diagnostic measures were analysed in the background of a variable engine load. The next (third) part will present the results of the calculations and analysis of the interaction coefficient of significance.
    Źródło:
    Polish Maritime Research; 2023, 3; 89-95
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the properties of the Generalized Normal Distribution
    Autorzy:
    Toulias, Thomas
    Kitsos, Christos
    Powiązania:
    https://bibliotekanauki.pl/articles/729804.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    entropy type Fisher's information
    Shannon entropy
    Normal distribution
    truncated distribution
    Opis:
    The target of this paper is to provide a critical review and to enlarge the theory related to the Generalized Normal Distributions (GND). This three term (position, scale shape) distribution is based in a strong theoretical background due to Logarithm Sobolev Inequalities. Moreover, the GND is the appropriate one to support the Generalized entropy type Fisher's information measure.
    Źródło:
    Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 35-49
    1509-9423
    Pojawia się w:
    Discussiones Mathematicae Probability and Statistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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