[R] Question about data used to fit the mixed model

From: Nantachai Kantanantha <kantanantha_at_hotmail.com>
Date: Sun 30 Jul 2006 - 14:33:14 EST

Hi everyone,

I would like to ask a question regarding to the data used to fit the mixed model.

I wonder that, for the response variable data used to fit the mixed model
(either via "spm" or "lme"), we must have several observations per subject
(i.e. Yij, i = 1,..,M, j = 1,.., ni) or it can be just one observation per
subject (i.e. Yi, i = 1,...,M). Since we have to specify the groups for random effect components, if we have only one observation per subject, then each group will have only one observation.

Thank you vert much for your help.
Sincerely yours,


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