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.
Thanks everybody.
Stephen
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