This is a question more directed at the Stata folks than to the listserve
per se.
Is there a reason why xtgee does not allow different weights/person/wave? It
gives an error message stating "weight must be constant within personnumber"
While I hate to invoke the phrase, "but SAS does it", I am forced to. There
is a growing body of literature in which the propensity score weighting
method is applied to longitudinal data. Thus, by it's very nature, weights
will differ within individuals over each wave.
I recogize GLLAMM as an option, but it is not very user friendly and
inordinately slower than other models within this family.
Consider this a plea for improvement.:-)
Thanks
Ariel
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