[R] a trivial question

How many levels can the the nlme function in nlme library handle when a multilevel dataset is fitted? It will be greatly appreciated if any examples with 3 or 4 levels can be shared. Thanks for your attention. Hua [[alternative HTML version deleted]]

[R] \Sexpr{}

Did anyone know whether the problem it doesn't evaluate \Sexpr{} in Sweave has been fixed? I checked r help page and realized it was asked a couple of years ago. But I didn't find solutions. Thanks for your help in advance! Hua [[alternative HTML version deleted]]