[R] some R code of linear mixed model

From: Manli Yan <manliyanrhelp_at_gmail.com>
Date: Tue, 17 Jun 2008 13:40:45 -0600

   Hello everyone:
  I have some quesions about the R code for linear mixed model,hope some one can give me some hints,thanks a lot~
  we have A B C three factors
(i)A is fixed ,B and C are random,and B is nested in C,so the R code for
this case would be:

   case1<-lme(y~A+B+C+......,random=~B|C) where "B|C" actually mean B is nested in C, is it correct?
(ii)and if I update the case as:
  updatedcase1<-update(case1,random=~1|C), did I just remove the random effect of B, and only random effect of C left in the model? is it correct?

 (iii)A ,B,is fixed ,but C is random,no nested case,how am I gonna write the R code,since

      lme(y~A+B+C+.....,random=~C) lead to error,

(iv)for the case1,if I wirte this

   updatedcase2<-update(case1,random=B-1|C) where,"B-1|C",what this syntax stand for in R?

thank you guys very much~

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