A two-stage stratified cluster sampling design was
employed. At the first stage all counties in the nation were divided
into six strata. At the second stage, a systematic sample of felons
sentenced for murder/nonnegligent manslaughter, rape, robbery,
aggravated assault, burglary, felony larceny/motor vehicle theft, drug
trafficking, and other offenses was selected from each county's
Sentenced felons in the United States.
official court records