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| From | Nick Cox <njcoxstata@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Change of reference group in linear multiple regression analysis |
| Date | Thu, 9 Aug 2012 14:38:21 +0100 |
Why not -recode- to say 1, 4, 8, 15, 25, 40 and use the quantitative information you have? Sure, there is some arbitrariness involved, but it is defensible. Nick On Thu, Aug 9, 2012 at 2:30 PM, Richard Goldstein <richgold@ix.netcom.com> wrote: > I assume you are using an up-to-date version of Stata; see -h fvvarlist- > and look under "base level" On 8/9/12 9:25 AM, Amal Khanolkar wrote: >> Hi, I'm currently running a linear multiple regression analysis where the principle explanatory variable is: >> >> Years since | >> immigration | Freq. Percent Cum. >> ------------+----------------------------------- >> <3 yrs | 106,794 3.57 3.57 >> 3-5 yrs | 91,311 3.05 6.62 >> 6-10 yrs | 96,657 3.23 9.85 >> 11-19 yrs | 82,344 2.75 12.61 >> 20-29 yrs | 50,954 1.70 14.31 >> >=30 yrs | 2,563,396 85.69 100.00 >> ------------+----------------------------------- >> Total | 2,991,456 100.00 >> >> - Currently the default group is the first category, <3yrs. I would however like to change this in the regression to the last group >=30 years. How do I do this without having to recode the above variable? * * 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/