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st: Chow test quadratic effect


From   natalia malancu <natalia.malancu@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Chow test quadratic effect
Date   Sat, 30 Mar 2013 22:18:02 +0100

Hi all,

I am estimating a mlogit model on two different groups. I then want to
test if there is a structural change. My
question is: how do I do Chow Test in stata if I have a quadratic term?

example:

webuse sysdsn4
gen agesq=age*age

 mlogit insure age agesq if male==1, base(1)
     estimates store m1
qui mlogit insure age agesq if male==0, base(1)
     estimates store m2
  suest m1 m2

for the main effect I use:
 test [m1_Prepaid]age =[m2_Prepaid]age
test[m1_Uninsure]age=[m2_Uninsure]age

If I am to consider age and agesq at the same time, then how do I do
so? Or should I just test them separately?

Thanks for helping,
Natalia
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