# of murder arrests
county identifier: 1000*statefips + countyfips
population density; per square mile
county population
% pop. age 10-19
% pop. age 20-29
percent population black
% population male
real per capita income maintenance
real per capita personal income
real per capita unem insurance payments
1980-1996
# of murders
murders per 10,000 people
murder arrests per 10,000
state FIPS code
county FIPS code
# of executions
log(popul)
executions per 10,000