R help - Nov 2001 - lme or nlme

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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Hi,
The package nlme by Pinero & Bates provides both lme() and nlme().
The sintax for lme() is
lme(y~x1+x2, random=~1+x1|z, data)
where y is the response x1 and x2 two fixed effects and x1 the variable with
random effects.

However see the very-clear help files in the package

best,
vito
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