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*** EX5.1******
 use "L:\Alma Kudebayeva\Fall2017\ECN5012 Econometrics\Chapter4\eaef22.dta", clear 
 
 su S ASVABC SM SF MALE
 tab S

 tab SM
 tab SF
 tab MALE
 tab S MALE
 
 sum S if MALE==1
 sum S if MALE==0
 
 reg S ASVABC SM SF MALE
 
***EX5.2**********
su WEIGHT85 HEIGHT
su WEIGHT85 if MALE==1

reg WEIGHT85 HEIGHT MALE

gen LGWEIGHT=ln(WEIGHT85)
gen LGHEIGHT=ln(HEIGHT)

reg LGWEIGHT LGHEIGHT MALE

test (LGHEIGHT=1)
******Ex 5.3* ***********
gen LEARN=ln(EARNINGS)

gen EBARG=EXP*COLLBARG

reg LEARN S EXP MALE COLLBARG EBARG


sum EARN if COLLBARG==1
sum EARN if COLLBARG==0
*****EX 5.7***********

reg LEARN EDUCPROF EDUCPHD EDUCMAST  EDUCBA  EDUCAA  EDUCDO EXP MALE


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