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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Programming stata using egen functions |

Date |
Tue, 28 Apr 2009 18:37:58 +0100 |

I don't see that this change does anything useful; it just makes the calculation more inefficient. Nick n.j.cox@durham.ac.uk Martin Weiss " So in line 9 I substitute `scalar’ for `local’ hoping that rowmax() could now recognize the varlist." Well, you have not passed a -varlist- to -egen, rowmax()- so it complains about its syntax statement not being respected, and rightly so. -local-s and -scalar-s are equally bad, in this respect. If that is all that is standing between you and success, then let the -gen- and -egen- statements refer to -tempvar-s. In this fashion, at least they will be legal... So instead of ** qui summarize `1' if `sp'==u local mean1_`s'`sp' =r(mean) ** say -egen mean1_ssp=mean(`1') if `sp'==u- Anne Resende Thanks a lot for all answers!! Just to clarify some points: I understood that the egen functions rowmax() and rowtotal() did not accept scalar. So in line 9 I substitute `scalar’ for `local’ hoping that rowmax() could now recognize the varlist. But stata returns de same error message. I need the rowmax() function to returns the maximum values between the varilist. (the maximum values within each `s’) So I have tried: 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. local m_`s'`sp'=`mean1_`s'`sp'' + ((`mean1_`s'`sp'' - `mean2_`s'`sp'')/(`sp'-8))*(9-`sp') 10. tempvar exem_`s' P_`s' ep_`s' ep2_`s' 11. qui egen `exem_`s''=rowmax(m_`s'`sp') 12. qui gen `P_`s''=sum(P) if `s'==u & id==1 13. qui sum `P_`s'', meanonly 14. local P1_`s'=r(max) 15. scalar ep_`s'=exem2_`s'*`P1_`s'' 16. qui egen `ep2_`s''=rowtotal(ep_`s') 17. return scalar eq2=`ep2_`s'' 18. } 19. } 20. end end of do-file . mymean loghw variable m_99 not found r(111); 1) I understand the differences between egen sum( )and stata fuctions sum(), but neither gives me what I need. I intend to use rowtotal() because it sums the observations on the rows not on the columns as egen sum() and sum() do. 2) Sorry about: return scalar eq29=rowtotal(ep_`s') that I wrote in the other email.. I know that it’s wrong 3)What is my aim? As I told I need to end up with one variable in order to run the bootstrap. I want to the create the program mymean and then run: bootstrap r(eq2), reps(#) seed(#) : mymean loghw (I am following the idea on: http://www.stata.com/capabilities/boot.html) 4)I think that I cannot use a do.file because I will end up with a constant (I also tried) and so I could not run the bootstrap. Creating and ado file the program allows me to use the boots after. So all I want to do is to write a program to calculate my statistics of interest and then apply the bootstrap. And my problem is how I can construct a varlist in order to run my program using rowmax() and rowtotal(). Or maybe there is another way to do that without having to use rowmax() and rowtotal() functions. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: Programming stata using egen functions***From:*Anne Resende <A.C.C.Resende@rhul.ac.uk>

**AW: st: Programming stata using egen functions***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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