st: Change of reference group in linear multiple regression analysis

[Amal Khanolkar <Amal.Khanolkar@ki.se>]

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


*
*   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/