st: adding results to esstab (by subgroups)

["Marco Francesco" <cariboupad@gmx.fr>]

Dear all (my previous post was incomplete)
 
 I would like to know how can I add the number of distinct observations of a variable X (or any other computation) to a table exported (in Latex) with esttab.
 In particular I am interested in summary table separated by groups :
 
 -estpost tabstat var1 var2 var3, by(id_group) statistics(mean sd) column(statistics)
 
 and thus I export the table in latex using (as suggested in 
 http://repec.org/bocode/e/estout/estpost.html#estpost104) 

-esttab, using mytable.tex main(mean) aux(sd) nostar unstack noobs nonote nomtitle nonumber 

 I can obtain the distinct values of X for each group using the function -distinct.
 The question is : how can I integrate these results to the previous table ? That is below all the statistics organized by groups, I would also like to have the corresponding number of distinct values of X...
 
 Many thanks for your help!
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