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Wyszukujesz frazę "Oliveira, João" wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Confidence intervals for large non-centrality parameters
Autorzy:
Inacio, Sonia
Oliveira, Manuela
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729746.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
asymptotic linearity
non-centrality parameters
highly significant
F tests
measure relevance
Opis:
We use asymptotic linearity to derive confidence intervals for large non-centrality parameters. These results enable us to measure relevance of effects and interactions in multifactors models when we get highly statistically significant the values of F tests statistics. We show how to use our approach by considering two sets of data as application examples.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2015, 35, 1-2; 45-56
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Modelling: Application to the financial sector
Autorzy:
Roçadas, Cláudia
Oliveira, Teresa
Mexia, João
Powiązania:
https://bibliotekanauki.pl/articles/729944.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
populations with periodic reclassification
likelihood ratio tests
Markov chains
isomorphism
Opis:
Our research is centred on the stochastic structure of matched open populations, subjected to periodical reclassifications. These populations are divided into sub-populations. In our application we considered two populations of customers of a bank: with and without account manager. Two or more of such population are matched when there is a 1-1 correspondence between their sub-populations and the elements of one of them can go to another, if and only if the same occurs with elements from the corresponding sub-populations of the other. So we have inputs and outputs of elements in the population and along with several sub-populations in which the elements can be placed. It is thus natural to use Markov chains to model these populations.
Besides this study connected with Markov chains we show how to carry out Analysis of Variance - like analysis of entries and departures to and from de populations of customers. Our purpose is to study the flows in and out of customers in classes for the two populations and to make research on the influence of the factors year, class and region. We used the Likelihood ratio tests for the hypotheses formulated on the basis of these factors. In our work we verified that major hypotheses were all rejected. This raises the question of what are the effects and interactions truly relevant. Looking for an answer to this problem, we present the first partition to a change in the log Likelihood. This partition is very similar to the analysis of variance for the crossing of the factors that allowed us to use algebraic established results, see Fonseca et al. (2003, 2006), for models with balanced cross.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 103-119
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Canonic inference and commutative orthogonal block structure
Autorzy:
Carvalho, Francisco
Mexia, João
Oliveira, M.
Powiązania:
https://bibliotekanauki.pl/articles/729946.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
COBS
canonical inference
commutative Jordan algebras
Opis:
It is shown how to define the canonic formulation for orthogonal models associated to commutative Jordan algebras. This canonic formulation is then used to carry out inference. The case of models with commutative orthogonal block structures is stressed out.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2008, 28, 2; 171-181
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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