[R] Longitudinal categorical response data
f.harrell at vanderbilt.edu
Tue Oct 23 20:24:17 CEST 2012
Random effects models of the type fitted by ordinal assume something akin to
compound symmetry, which is not realistic when time between measurements is
long or irregular.
Rune Haubo-2 wrote
> lmer is not designed for ordered categorical data as yours are. You could
> take a look at the ordinal package which is designed for this type of data
> including mixed models (function clmm) which you probably want to use.
> Den 24/03/2011 21.03 skrev "Rasanga Ruwanthi" <
>> Dear List,
>> I have some longitudinal data, each patient was followed at times 0, 12,
> 16, 24 weeks and measure severity of a illness (0-worse, 1-same,
> So, longitudinal response is categorical. I was wondering whether lmer in
> can fit a model for this type of data. If so, how we code? Or any
> other function in R that can fit this type of longitudinal data? Any
> suggestion would be greatly appreciated.
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Department of Biostatistics, Vanderbilt University
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