# Practice 1.2 - Exercise US wages

open "...\USwages.gdt"

#a)
summary wage --simple

#b)
print wage age --byobs

#c)
genr logwage = log(wage)

#Or: 
# logs wage
summary logwage --simple

#d)
freq educ
#Also:
smpl educ=12 --restrict
smpl educ>=16 --restrict --replace
smpl --full

## Be careful! An error will stop your script:
# smpl educ=0 --restrict

#e)
freq black
summary wage --by=black --simple
#Also:
smpl black --dummy
summary wage --simple
smpl --full
 
#f) Sort by wage in descendent order
dataset dsortby wage
print age black married wage  --byobs
#Also, since we know the maximum wage in the sample:
smpl wage=3088 --restrict
summary age black married --simple
smpl --full