[R] Error in nlme ranef plot()

[Yang, Richard]

Dear R list members;

I have a 10 x 423 data frame which consisting of response, time, subject,
site, plot and covariates (continueous and categorical) measured at the plot
level. When the data frame was converted into a groupedData object, a
warning appeared

> A <- groupedData(ht ~ time | Subject, data = tt, outer = ~ site * plot,
+      labels=list(y = "Height", x = "Time", units = list( y = "(m)", x =
"(Yr)")) )
Warning message: 
argument lengths differ in: split(x, f).

The warning did not affect the estimation of a nlme model with parameters
B1, B2, and B3. However, when plotting  the estimated ranef versus
covariates, an error resulted

> A1Mod.nlmeRE <- ranef(A1Mod.nlme, aug=T)

> plot(A1Mod.nlmeRE, form = B1 ~ Ps + Dr + El + As + Sl) results in 
Error in max(length(x0), length(x1), length(y0), length(y1)) : 
        Argument "x0" is missing, with no default 

The same data frame and commands works fine with Splus 6 on W2K. Is this a
bug in nlme 3.3.x? I use R 1.4.1.

Thanks,

Richard








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