seminario Prof. Rudas

[Julia Mortera <mortera@uniroma3.it>]

AVVISO DI SEMINARIO


Venerdi' 6 Aprile ore 11.30 Aula 6, presso la sede del Dipartimento di
Economia, Universita' di Roma Tre, Via Ostiense 139

il Prof. TAMAS RUDAS del Dipartmento di Statistica, Universita' Eotvos
Lorand, Budapest

terra' il seguente seminario:

                       On marginal models for categorical data



Marginal models for a multiway contingency table are specified by affine

restrictions on log-linear parameters that are defined for certain
marginals of the table. Such models can be applied to a wide range of
statistical problems, from Markov chains to test-retest problems and to
data fusion. After some introductory examples, the talk will discuss
marginal log-linear parameterizations of the distribution on the
contingency table. It will be shown how certain combinatorial properties

of the marginals and the effects involved imply variation independence
of
the resulting parameters. Conditions for the existence of log-affine
marginal models and for the existence and asymptotic normality of
maximum
likelihood estimates under such models will also be given. This
presentation is based on joint work with Wicher Bergsma.


--
Julia Mortera
Dipartimento di Economia
Universita' di Roma Tre
Via Ostiense 139
00154 Roma, Italy
tel: +39-06-5737-4206      Fax: +39-06-5737-4093


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