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

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

Subject |
st: looping over strings [was: RE: Re: statalist-digest V4 #1066] |

Date |
Thu, 14 Nov 2002 11:12:45 -0000 |

Yan elaine Li > > I would like to get help on the following problem: > > i have a life history dataset on job mobility, where for each > observation i have the following variables: > > job01 start01 end01 indstr01 income01 ... job12 - income12 ... > > where 'start01' means the starting year and 'end01' means the > ending year of the first job. > > I also have a variable 'yrmar' (year married), and my task is to > find out what job a person had when s/he got married and how > much they earn from that job and so on. > > I tried the following code and it obviously doesn't work when > you have a variable named "start01" instead of "start1": > > gen jobmar=. > gen incmar=. > forvalues i=01(1)12 { > if (yrmar >= start`i' & yrmar<= end`i') { > replace jobmar=job`i' > replace incmar=income`i' > } > } > > I guess the central question is how to loop using strings/chars > rather than number. > Solution 1 ========== You can fix this upstream by removing the leading zeroes from your variable names. foreach stub in job start end indstr income { renvars `stub'0? \ `stub'1-`stub'9 } and then go forvalues i=1/12 { ... } Here -renvars- is a program published in STB-60. Solution 2 ========== Or you can loop over strings by spelling them out foreach y in 01 02 03 04 05 06 07 08 09 10 11 12 { ... } Simple, and quick in this example, but inelegant. Solution 3 ========== Or you could do this: forval j = 1/12 { local i : di %02.0f `j' <code in terms of `i'> } The leading zero format puts a "0" in front of any single digit. Warning ======= However, there is a _big_ bug of a different kind now lurking in your code. if (yrmar >= start`i' & yrmar<= end`i') { replace jobmar=job`i' replace incmar=income`i' } You don't mean what you write here, I guess. See the FAQ I have an if command in my program that only seems to evaluate the first observation. What's going on? http://www.stata.com/support/faqs/lang/ifqualifier.html I think you need replace jobmar=job`i' if (yrmar >= start`i' & yrmar<= end`i') replace incmar=income`i'if (yrmar >= start`i' & yrmar<= end`i') Comment ======= Many things are going to be easier if you -reshape- this data set to long. See [R] reshape and, if need be, the FAQ I am having problems with the reshape command. Can you give further guidance? http://www.stata.com/support/faqs/data/reshape3.html Nick n.j.cox@durham.ac.uk * * 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/

**References**:**st: Re: statalist-digest V4 #1066***From:*Yan elaine Li <liy@Stanford.EDU>

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