Hi everyone,
After running
I got "must specify timevar; use xtset" error message.
When I changed correlation structure to
or
it ran perfectly.
Any suggestions why this happened?
Cheers,
After running
Code:
xtset SurveyID_code xtgee DLP kVp , corr(unstructured) vce(robust)
When I changed correlation structure to
Code:
xtset SurveyID_code xtgee DLP kVp , corr(independent) vce(robust)
Code:
xtset SurveyID_code xtgee DLP kVp , corr(exchangable) vce(robust)
Any suggestions why this happened?
Cheers,
Comment