population
total number index crimes
unemployment rate
number police officers
per capita income
=1 if city in west
=1 if city in NE
=1 if city in south
82 or 87
land area, square miles
=1 if year = 87
people per sq mile
crimes per 1000 people
officers per sq mile
law enforce. expend. pc, $
police per 1000 people
log(pop)
log(officers)
log(pcinc)
log(lawexpc)
log(popden)
log(crimes)
log(area)
log(crmrte)
change in lcrimes
change in lpop
change in lcrmrte
log(polpc)
change in lpolpc
change in llawexp
change in unem
change in lpopden
lcrmrte lagged
change in crmrte
city code