Autor: Nunes, Célia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Non-central generalized F distributions
Autorzy:: Nunes, Célia
Mexia, João
Powiązania:: https://bibliotekanauki.pl/articles/729690.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: exact distributions
random non-centrality parameters
generalized F distributions
Opis:: The quotient of two linear combinations of independent chi-squares will have a generalized F distribution. Exact expressions for these distributions when the chi-square are central and those in the numerator or in the denominator have even degrees of freedom were given in Fonseca et al. (2002). These expressions are now extended for non-central chi-squares. The case of random non-centrality parameters is also considered.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2006, 26, 1; 47-61
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Selective F tests for sub-normal models
Autorzy:: Nunes, Célia
Mexia, João
Powiązania:: https://bibliotekanauki.pl/articles/729820.pdf
Data publikacji:: 2003
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: ective F tests
sub-normal models
max-min tests
orderings
Opis:: F tests that are specially powerful for selected alternatives are built for sub-normal models. In these models the observation vector is the sum of a vector that stands for what is measured with a normal error vector, both vectors being independent. The results now presented generalize the treatment given by Dias (1994) for normal fixed-effects models, and consider the testing of hypothesis on the ordering of mean values and components.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2003, 23, 2; 167-174
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Generalized F tests and selective generalized F tests for orthogonal and associated mixed models
Autorzy:: Nunes, Célia
Pinto, Iola
Mexia, João
Powiązania:: https://bibliotekanauki.pl/articles/729658.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: selective generalized F tests
generalized polar coordinates
associated models
Opis:: The statistics of generalized F tests are quotients of linear combinations of independent chi-squares. Given a parameter, θ, for which we have a quadratic unbiased estimator, θ̃, the test statistic, for the hypothesis of nullity of that parameter, is the quotient of the positive part by the negative part of such estimator. Using generalized polar coordinates it is possible to obtain selective generalized F tests which are especially powerful for selected families of alternatives. We build both classes of tests for the orthogonal and associated mixed models. The associated models are obtained adding terms to the orthogonal models.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2008, 28, 2; 229-246
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: F and selective F tests with balanced cross-nesting and associated models
Autorzy:: Nunes, Célia
Pinto, Iola
Mexia, João
Powiązania:: https://bibliotekanauki.pl/articles/729986.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: selective F tests
associated models
cross-nesting
Opis:: F tests and selective F tests for fixed effects part of balanced models with cross-nesting are derived. The effects of perturbations in the numerator and denominator of the F statistics are considered.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2006, 26, 2; 193-205
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Generalized F tests in models with random perturbations: the gamma case
Autorzy:: Pinto Nunes, Célia
Bargão Saraiva Ferreira, Sandra
da Conceição Ferreira, Dário
Powiązania:: https://bibliotekanauki.pl/articles/729976.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: generalized F distributions
random non-centrality parameters
Gamma distribution
Opis:: Generalized F tests were introduced for linear models by Michalski and Zmyślony (1996, 1999). When the observations are taken in not perfectly standardized conditions the F tests have generalized F distributions with random non-centrality parameters, see Nunes and Mexia (2006). We now study the case of nearly normal perturbations leading to Gamma distributed non-centrality parameters.
Źródło:: Discussiones Mathematicae Probability and Statistics; 2009, 29, 2; 185-197
1509-9423
Pojawia się w:: Discussiones Mathematicae Probability and Statistics
Dostawca treści:: Biblioteka Nauki

Artykuł

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