R-Help,
I been using nlme to fit a model with 2 random effects. The correlation
matrix I get with the VarCorr command does not seem to have the correct
value for the correlation entry. E.g., below is a VarCorr matrix of random
effects from data that I am working on:
Variance StdDev Corr
b1 14.386191885 3.79291338 b1
b3 0.002872538 0.05359606 0.109
Residual 0.052819504 0.22982494
The Corr value 0.109 does not appear to be correct. SAS gives a Corr value
that is the square of the value got in R. I get nonsensical results when I
use the value given by R. Could someone check this out.
Charles O. Sabatia
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