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RE: st: How to add restriction condition in Stata

From   Richard Williams <[email protected]>
To   [email protected]
Subject   RE: st: How to add restriction condition in Stata
Date   Fri, 29 Jul 2005 12:34:58 -0500

At 12:07 PM 7/29/2005 -0500, FEIVESON, ALAN H. (AL) (JSC-SK) (NASA) wrote:
I still don't see why you can't sum the ages. What's the difference between:

y ~ Poisson(la); log la = b0 + b1*age1 + b2*age2  with b1=b2


y ~ Poisson(la); log la = b0 + b1*(age1+age2) ?

Al Feiveson
I agree with Alan. Also I am not sure if this solves the problem - you can impose constraints but they have to make sense, i.e. the effect of age1 really does have to equal the effect of age2. Just curious, is this approach based on published research? If so I'd be interested in looking at it.

Richard Williams, Notre Dame Dept of Sociology
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