Re: st: RE: different n's using "if"

["Sarah A. Mustillo" <smustillo@psych.mc.duke.edu>]

Thanks to all who replied to my question.  Sometimes the simple things are 
the hardest for me to figure out!  I appreciate you all clearing this up 
for me.  I tried it the way you suggested and, of course, it worked. 
Thanks.

Sarah







> >  xi: xtgee pul    per2Xlagccm period2 lagccm age if
> > sex==0&racewh==1&period==1|2 [pweight=wt], robust corr(exch)
> You've got a problem with your "period==1|2".  It needs to be (with
> spaces to make things easier to read:
>
> 	sex==0 & racewh==1 & (period==1 | period==2)
>
> YOu can't do "something==this|that"; you need to do "something==this |
> something==that",
> or use the inlist function:  inlist(something,this,that).
>
> Your confusing results occurs because Stata is evaluating:
>
> 	(sex==0&racewh==1&period==1) | (2)
>
> and (2) is always true.
>
> --Nick Winter
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/


Sarah A. Mustillo, Ph.D
Center for Developmental Epidemiology
Department of Psychiatry and Behavioral Sciences
Duke University School of Medicine
Box 3454
Durham NC 27710

919 687-4686 x234

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/