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st: how to let loop continue when no observation svy:mean: --capture--gives errors


From   Amanda Fu <mandy.fu1@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: how to let loop continue when no observation svy:mean: --capture--gives errors
Date   Fri, 17 Jun 2011 18:45:54 -0400

Hi all,

I am trying to collect the results for the weighted mean of a set of varaibles.
------------------
****using matrix stats to collect the results
matrix stats=J(150,10,-99)
forvalue i=1/10 {
        local k=0
  forvalue j=5/20 {
     local ++k
     svy:mean v`i'_`j' if  a==`i' & b==`j'
        matrix stats(`i',`k')=r(mean)
   }
   }
-------------------

The above codes stop somewhere since "there is no observation" for
some of the conditions.
In order to make the loop keep going, I add capture before "svy:mean
v`i'_`j' if  a==`i' & b==`j'"
But in the resulted matrix, the places that should be shown as "." are
filled with the previous nonmissing values. That causes confusion.
Therefore, I wonder how I can let the loop continue even when there
are cases that there is no observations ?

Thank you!

Best wishes,
Amanda
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