[R] lme or nlme

[Deborah McNaughton]

I'm trying to run a linear mixed effects model using
nlme.  It appears that lme is not available for R, but
looks like I should be able to run linear models using
nlme.  What I tryed looks something like this:
fit <- nlme (Y ~ A + B + C + D,
fixed=list(A,B,C,D),random=Z).  This didn't work.  I
got this error:  Error in reStruct(random, REML =
REML, data = NULL) : 
        Object must be a list or a formula

I also tryed creating a function fun <-
function(a,b,c,d) a+b+c+d
Then tryed
fit <- nlme(Y ~ fun(A,B,C,D),
fixed=list(A,B,C,D),random=list(Z)).  
I got this error message: 
Error in FUN(X[[1]], ...) : Elements in object must be
formulas or pdMat objects

Please help me!

Thank you,
Debbie


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