st: Problem with looping when executing command

["Kim, Isok" <isokkim@buffalo.edu>]

Hi,

I'm having trouble with running exactly same syntax with different subgroups. Analysis on one group runs just fine, but when I execute same syntax with another group, it just keeps looping without doing anything. I never encountered this in Stata.  I don't know if it'll be helpful but I'm pasting one set of command lines that works and another that doesn't:

/*nbreg: cardio overall*/
set more off
svy, subpop(subsdh): nbreg cardio AGE i.female i.married i.ed3cat ib3.as4cat i.generation ///
								  i.poverty i.no_ins discr i.ELP srph bias, irr

/*nbreg: cardio Vietnamese*/
set more off
svy, subpop(subsdh if as4cat==1): nbreg cardio AGE i.female i.married i.ed3cat i.generation ///
								   i.poverty i.no_ins discr i.ELP srph bias, irr

I know I'm being cryptic here, but that's just it - I don't know how to explain the error without any feedback from the Stata... Any ideas???

Thanks a bunch!
isok

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/