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st: comparing coefficients


From   John Stymans <johnstymans@hotmail.be>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: comparing coefficients
Date   Wed, 9 Jan 2013 10:30:11 +0100

Dear Statalist Users,
I have a problem when comparing coefficients across groups.
I am using Stata 12.
I first run an ordered logit model for two groups (males and females).
 
ologit y1 i.education age income class household country if gender=0, or store(step1a) 
ologit y1 i.education age income class household country if gender=1, or store(step1b) 
goal is to compare across gender the effect of education which is a categorical variable with 3 values, hence the use of i..
 
when I use suest:
 
suest step1a step1b
 
test [step1a _y1]i.education=[step1b_y1]i.education
 
the command does not work. I am however able to split education in three values an add two of them to the regression (omitting educationlow);
 
ologit y1 educationmedium educationhigh age income class household country if gender=0, or store(step1a) 
ologit y1 educationmedium educationhigh age income class household country if gender=1, or store(step1b) 
and than run suest:
 
suest step1a step1b
 
test [step1a _y1]loweducation=[step1b_y1]loweducation
 
Yet I am unable to compare the difference in significance of education across gender in general. Does anyone know how to solve this issue?
 
Many thanks in advance and best regards,
 
John
  		 	   		  
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