st: Flagging Singleton Observations after XTIVREG2

["Erasmo Giambona" <e.giambona@gmail.com>]

Dear Statalisters,

Is there a way to flag singleton observations not used when running
XTIVREG2? I tried to to use e(sample) to obtain decriptive statistics
with the sum command on the same sample used by XTIVREG2, but the sum
command would use the singleto observations not used by XTIVREG2.
Any suggestions would be appreciated.
Regards,
Erasmo
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/