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.

Best,
Rune

Den 24/03/2011 21.03 skrev "Rasanga Ruwanthi" <ruwanthi_kdr@yahoo.com>:
>
> 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, 2-better).
So, longitudinal response is categorical.  I was wondering whether lmer in R
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.

>
> Thanks
> Ruwanthi
>
>
>
>
>        [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

	[[alternative HTML version deleted]]

