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# PS7.6, for the Application in Section 7.6
open data7-4
# generate interactions between D90 and the explanatory variables
genr D90YF = D90*YF
genr D90YM=D90*YM
genr D90EDUC=D90*EDUC
genr D90UE=D90*UE
genr D90MR=D90*MR
genr D90DR=D90*DR
genr D90URB=D90*URB
genr D90WH=D90*WH
varlist
# Estimate the most general model 
ols WLFP const D90 YF D90YF YM D90YM EDUC D90EDUC UE D90UE MR D90MR \
 DR D90DR URB D90URB WH D90WH 
# omit variables one at a time 
omit YM  
omit D90EDUC  
omit D90  
omit D90YM  
omit D90WH  
omit D90URB  
# final model 
omit D90DR