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Re[5]: st: Problem with foreach loops


From   Ian Watson <i.watson@econ.usyd.edu.au>
To   Nick Cox <statalist@hsphsun2.harvard.edu>
Subject   Re[5]: st: Problem with foreach loops
Date   Tue, 8 Jun 2004 09:47:17 +1000

Dear Nick,

  Thanks for this. It works a treat. Tokenize is a nice approach. I'd
  only ever thought of it in the context of ado programs.

  And thanks Richard re. -recode-. You're right about the -gen- option
  working for multiple vars (which I should have realised from the
  manual's syntax, even if there were no examples).

-- 
Kind regards,
 Ian                          

=====================
Ian Watson
Senior Researcher
acirrt
University of Sydney
NSW 2006
Australia
======================

Monday, June 7, 2004, 10:48:38 PM, you wrote:

NC> In two cases here a``i'' should be a_``i'' 

NC> Nick 
NC> n.j.cox@durham.ac.uk 

>> -----Original Message-----
>> From: Nick Cox 
>> Sent: 07 June 2004 11:30
>> To: 'statalist@hsphsun2.harvard.edu'
>> Subject: RE: Re[3]: st: Problem with foreach loops
>> 
>> 
>> I think you just have your source and target confused. 
>> 
>> local i=1
>> foreach v in ajbmspay ajbmssec ajbmswrk ajbmshrs ajbmsflx ajbmsall {
>>    local n : word `i' of pay security work hours flexibility overall
>>    recode `v' (-4 -3 -1 =.), gen(a_`n')
>>    la var a_`n' "Satisfaction with `n'"
>>    local i=`i'+1
>> } 
>> 
>> Note that this is just one answer. 
>> 
>> If you know -tokenize-, you can 
>> 
>> tokenize pay security work hours flexibility overall
>> local i=1
>> foreach v in ajbmspay ajbmssec ajbmswrk ajbmshrs ajbmsflx ajbmsall {
>>    recode `v' (-4 -3 -1 =.), gen(a_``i'')
>>    la var a``i'' "Satisfaction with ``i''" 
>>    local i=`i'+1
>> } 
>> 
>> and the incrementation can also be done this way 
>> 
>> tokenize pay security work hours flexibility overall
>> local i=1
>> foreach v in ajbmspay ajbmssec ajbmswrk ajbmshrs ajbmsflx ajbmsall {
>>    recode `v' (-4 -3 -1 =.), gen(a_``i'')
>>    la var a``i'' "Satisfaction with ``i++''" 
>> } 
>> 
>> In this instance, I think this last version 
>> is not as clear as the previous one. 
>> 
>> Nick 
>> n.j.cox@durham.ac.uk 
>> 
>> Ian Watson
>>  
>> > As a follow up to my last email, I've found the answer to 
>> this problem
>> > using -foreach-. Courtesy of Nick Cox's article in State 
>> Journal 3(2)
>> > 2003, the trick is to step through a non-numerical list using "word
>> > [num] of".
>> > 
>> > Here is the code that works:
>> > 
>> > 
>> > local i=1
>> > foreach v in ajbmspay ajbmssec ajbmswrk ajbmshrs ajbmsflx ajbmsall {
>> >   local n : word `i' of pay security work hours flexibility overall
>> >   recode `v' (-4 -3 -1 =.), gen(a_`n')
>> >   la var `v' "Satisfaction with `n'"
>> >   local i=`i'+1
>> > }  
>> > 
>> > 
>> > There remains, however, still one bug. The label variables 
>> command is
>> > not being executed, and the recode command's own variable 
>> > label remains
>> > attached to the new variables. Does anyone have any thoughts?
>> 

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

Richard wrote:

Perhaps I misunderstand you, but isn't this example from the online docs
(which might be more current than the manual) what you mean?

recode x1 x2 (1 2 3/5=1) (6/10=2), gen(nx1 nx2)

In the case of your original example (following is meant to be all one line)

recode  ajbmspay ajbmssec ajbmswrk ajbmshrs ajbmsflx ajbmsall(-4 -3 -1=.), 
gen(a_pay a_security a_work a_hours a_flexibility a_overall)


*
*   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/



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