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From |
"Michael Blasnik" <mblasnik@verizon.net> |

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

Subject |
st: Re: RE: RE: mapping a value from 2 variables |

Date |
Wed, 24 Jul 2002 15:35:46 -0400 |

In trying to automate value label creation from a numeric and string var, Joly.Patrick@ic.gc.ca wants to avoid an explicit loop over n for large datasets. Here is one approach that I think works gen str1 cmd="" replace cmd="label define mylab "+string(nvar)+char(34)+svar+char(34)+" ,modify" outsheet cmd using cmd.do, nonames noquote drop cmd Then you can -run cmd- This approach just builds a string variable that has the label define commands and uses char(34) to insert quotes. Of course, if you have repetitive values of nvar you should first collapse the dataset down to one obs for each nvar Michael Blasnik > n.j.cox@durham.ac.uk wrote > > > > I don't know of anything quite like this, but > > for once a looping over observations would seem > > to solve the problem: > > > > local N = _N > > forval i = 1/`N' { > > local val = naics[`i'] > > local label = labelnaics[`i'] > > label def naicslab `val' "`label'" , modify > > } > > > > Nick > > n.j.cox@durham.ac.uk > > This will work, no doubt. The reason I hadn't considered -forvalues- for > this purpose was that I wanted to avoid looping over observations. Such > looping is not so bad with my current data which contains approx. 2000 > observations but may be computationaly intensive and slow if I try to extend > the procedure to situations where labels may take up to 65,536 different > coding values -- the Stata limit for value labels. I tested the loop on a > dataset of 30,000 observations and it took 2 minutes to complete, which is > not the end of the world for the use I'll make of it. > > But what escaped me in my own proposed solution below is that step 2 (where > I would use -file- to substitute a space-character for the first comma) > would itself require looping over observations (!). I will probably go with > Nick's solution as I don't see anything else for now. > > ... * * 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/

**Follow-Ups**:**st: RE: Re: RE: RE: mapping a value from 2 variables***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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