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


From   "Sarah Edgington" <[email protected]>
To   <[email protected]>
Subject   st: RE: RE: Change of reference group in linear multiple regression analysis
Date   Thu, 9 Aug 2012 15:03:49 -0700

I think Peter may have meant to suggest you look at -help fvvarlist- since
searching for fvvariable doesn't get any results.
Specifically see the section on base levels in the help for factor
variables.  (you can just type -help factor variables- if fvvarlist is hard
to remember)

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Lachenbruch,
Peter
Sent: Thursday, August 09, 2012 2:31 PM
To: [email protected]
Subject: st: RE: Change of reference group in linear multiple regression
analysis

check on fvvariable.

________________________________________
From: [email protected]
[[email protected]] On Behalf Of Amal Khanolkar
[[email protected]]
Sent: Thursday, August 09, 2012 6:25 AM
To: [email protected]
Subject: st: Change of reference group in linear multiple regression
analysis

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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