[R] Question about data used to fit the mixed model
kantanantha at hotmail.com
Sun Jul 30 06:33:14 CEST 2006
I would like to ask a question regarding to the data used to fit the mixed
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.
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