Displaying 1 result from an estimated 1 matches for "tp25044356p25061604".
2009 Aug 19
1
how to specify two variance effects in gls
Hello everybody,
I have a dataset where each row has number of subjects and that gives me natural weights for the variance function. Additionally I see that variance increases with Age, which is a regressor.
So using gls I have
weights=varFixed(~1/n)
but don't know how to include the extra effect of the regressor.
Fitted values show a quadratic curve vs. age, not sure if that helps.