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Re: st: Change of reference group in linear multiple regression analysis


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Change of reference group in linear multiple regression analysis
Date   Thu, 09 Aug 2012 09:30:34 -0400

I assume you are using an up-to-date version of Stata; see -h fvvarlist-
and look under "base level"

Rich

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?
> 
> Thanks,
> 
> /Amal.
> 
> Amal Khanolkar, PhD candidate,
> Centre for Health Equity Studies (CHESS),
> Karolinska Institutet,
> 106 91 Stockholm.
> Ph# +46(0)8 162584/+46(0)73 0899409
> www.chess.su.se
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