[Statlist] (no subject)

[Christina Kuenzli]

                  ETH and University of Zurich 

                           Proff. 
         A.D. Barbour - P. Buehlmann - F. Hampel - L. Held
            H.R. Kuensch - M. Maathuis - S. van de Geer

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           We are glad to announce the following talk
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      April 4, 2008,     15.15-17.00   LEO C 6

      Modeling Longitudinal Data with Application to 
      the Multicenter Aids Cohort (MACS) 
      Cyntha A. Struthers, University of Waterloo, Ontario, CA  


Motivated by an example in the book ``Analysis of Longitudinal Data'' by
Diggle, Heagerty, Liang and Zeger, we analyze longitudinal data from the
2007 release of the Multicenter Aids Cohort Study (MACS). The response
(CD4 count for seroconverters) is fitted using a stochastic process with
parameters which are functions of time-dependent covariates.   There are
extensive missing values in these data which are partially accommodated
in our analysis. The parameters are estimated using both Bayesian and
frequentist methods.  We obtain the asymptotic covariance matrix of the
estimators and Bayesian credible regions for the parameters, the latter
by Gibbs sampling. This allows us to estimate the time course for
individuals taking account of measurement error. 
      

     
________________________________________________________
Christina Kuenzli            <kuenzli using stat.math.ethz.ch>
Seminar fuer Statistik      
Leonhardstr. 27,  LEO D11      phone: +41 (0)44 632 3438         
ETH-Zentrum,                   fax  : +41 (0)44 632 1228 
CH-8092 Zurich, Switzerland        http://stat.ethz.ch/~