[Todos] Seminario EMEA

[Mariela Sued]

Seminario de Estadistica, Modelizacion Estocastica y Aplicaciones (EMEA)

 Proximo encuentro:  Miercoles 14 de mayo.

 EXPOSITOR: Tomás Tetzlaff,  Facultad de Ciencias Exactas y Naturales,
Universidad de Buenos Aires.
 TITULO: A mixture model for the detection of Neosporosis without a gold
standard
 LUGAR: INSTITUTO DE CALCULO, PAB II 2ª piso.
 HORA: 12 hs.

RESUMEN: Neosporosis is a bovine disease caused by the parasite Neospora caninum.
It is not yet sufficiently studied, and it is supposed to cause an
important number of abortions. Its clinical symptoms do not yet allow the
reliable identification of infected animals. Its study and treatment would
improve if a test based on antibody counts were available. Knowing
the distribution functions of observed counts of uninfected and of
infected cows would allow the determination of a cutoff value. These
distributions cannot be estimated directly. This paper deals with the
indirect estimation of these distributions based on a data set consisting
on the antibody counts for some 200 pairs of cows and their calves. The
desired distributions are estimated through a mixture model based on
simple assumptions that describe the relationship between each cow and its
calf. The model then allows the estimation of the cut off value and of the
error probabilities. Joint work with Andrés Farall and Ricardo Maronna.



 Quedan todos cordialmente invitados
 Pablo Groisman -  Mariela Sued