percentage of males aged 14–24 in total state population
indicator variable for a southern state
mean years of schooling of the population aged 25 or more
per capita expenditure on police protection in 1960
per capita expenditure on police protection in 1959
labour force participation of civilian urban males age 14-24
number of males per 100 females
state population in 1960 in hundred thousands
percentage of nonwhites in the population
unemployment rate of urban males 14–24
unemployment rate of urban males 35–39
wealth: median value of transferable assets or family income
inequality: percent of families earning below half the median income
probability of imprisonment: ratio of commitments to offenses
average months served in state prisons before first release
crime rate: number of offenses per 100,000 population in 1960