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st: Time Interaction with xtgee
I am trying to analyze panel data using the xtgee
command. My initial model is as follows:
iis DDS_ID (Dentist ID)
tis time (t= 0, 1, 2, 3)
xtgee depvar gender classification, fam(gaussian)
The "time" variable corresponds to baseline, 3 months,
6 months and 12 months post introduction of
The "classification" variable corresponds to the level
of education (e.g., no education, mid level education,
in depth education).
Since I expect a change in the depvar from t=0
(baseline)to the individual timepoints, should I
include the time variable in the model, in addition to
setting it in the "tis" command?. Also, how would I
test for interaction between the "classification" and
"time" if I do not include "time" in the model?
Thanks for any help.
Michael Gregory Schmader, M.S.
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