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st: Interval variables as independent variables


From   "Jessica A.Jakubowski" <j-jakubowski@northwestern.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Interval variables as independent variables
Date   Sat, 08 Nov 2008 15:16:22 -0600

I have data that includes an income variable measured at the interval level, e.g.:
1= less than $10,000
2= $10,000-$15,000
3= $15,000-$20,000
4= $20,000-$25,000
5= $25,000-$35,000
6= $35,000-$50,000
7= $50,000-$75,000
8= over $75,000

Stata has a way to deal with interval data when it is a dependent variable in a regression model
with the command -intreg-

I would like to know if Stata has a way to deal with interval variables on the right-hand side of
the regression equation, that is, as an independent variable.  I am using this interval income
variable in models with continuous (-regress-) and binary (-logit-) outcomes.  Right now, I am
using the midpoint of the intervals (and the open top interval*1.5), but I'm wondering if there's a 
better way.

Thanks!
Jessica




**********************************
Jessica A. Jakubowski
Research Data Analyst
Psycho-Legal Studies Program
Northwestern University
710 N. Lake Shore Drive Suite 900
Chicago, Illinois 60611
Ph: 312-503-3519
Fax: 312-503-3535 
**********************************


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