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st: Programming stata using egen functions


From   Anne Resende <A.C.C.Resende@rhul.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Programming stata using egen functions
Date   Tue, 28 Apr 2009 01:05:25 +0100 (BST)

Dear All
I am having some problems with my ado.file whenever I try to include 
some egen functions like rowmax and rowtotal. I am currently using 
Stata 10.0
 
My ado program is:
 
 program mymean, rclass
  1.   syntax [varlist] [if]
  2.   tokenize "`varlist'"
  3.   forvalues s=9(1)20 {
  4.   forvalues sp=9(1)`s' {
  5.         qui summarize `1' if `sp'==u
  6.         local mean1_`s'`sp' =r(mean)
  7.         qui sum `1' if u==8
  8.         local mean2_`s'`sp' =r(mean)
  9.           scalar m_`s'`sp'=`mean1_`s'`sp'' + ((`mean1_`s'`sp'' - 
`mean2_`s'`sp'')/(`sp'-8))*(9-`sp')
 10.         tempvar exem_`s' P1_`s' P_`s' ep_`s' ep2_`s'
 11.         qui egen `exem_`s''=max(m_`s'`sp')
 12.           return scalar exem2_`s'=`exem_`s''*1
 13.           qui gen `P1_`s''=sum(P) if `s'==u & id==1
 14.           qui egen `P_`s'' =max(`P1_`s'') 
 15.           scalar ep_`s'=exem2_`s'*`P_`s'' 
 16.         qui gen `ep_`s''=exem2_`s'*`P_`s''
 17.         return scalar eq29=sum(ep_`s')
 18. }
 19. }
 20. end
This program is running well. But in lines 11 and 17, I in fact need to 
use the commands rowmax rather than max and rowtotal rather sum. So 
when I use max and sum the program runs well but when I substitute this 
commands whith rowmax and rowtotal stata gives me the following error 
message after I typed mymean loghw: 
 
 
 program mymean, rclass
  1.   syntax [varlist] [if]
  2.   tokenize "`varlist'"
  3.   forvalues s=9(1)20 {
  4.   forvalues sp=9(1)`s' {
  5.         qui summarize `1' if `sp'==u
  6.         local mean1_`s'`sp' =r(mean)
  7.         qui sum `1' if u==8
  8.         local mean2_`s'`sp' =r(mean)
  9.           scalar m_`s'`sp'=`mean1_`s'`sp'' + ((`mean1_`s'`sp'' - 
`mean2_`s'`sp'')/(`sp'-8))*(9-`sp')
 10.         tempvar exem_`s' P1_`s' P_`s' ep_`s' ep2_`s'
 11.         qui egen `exem_`s''=rowmax(m_`s'`sp')
 12.           return scalar exem2_`s'=`exem_`s''*1
 13.           qui gen `P1_`s''=sum(P) if `s'==u & id==1
 14.           qui egen `P_`s'' =max(`P1_`s'') 
 15.           scalar ep_`s'=exem2_`s'*`P_`s'' 
 16.         qui gen `ep_`s''=exem2_`s'*`P_`s''
 17.         return scalar eq29=rowtotal(ep_`s')
 18. }
 19. }
 20. end
. 
end of do-file
. mymean loghw
variable m_99 not found
r(111);

So I would like to know why the program recognizes the max and sum egen 
functions but do not recognize (or do not find my variable) when I use 
the rowmax and rowtotal egen functions. Is there any programming 
differences between these two kind of egen functons?
Thanks a lot 
Anne

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