ICPSR is the world's largest repository of social science research data sets. Most data sets are available in Stata, SPSS, R and SAS formats. ICPSR also lists recent publications that utilized the data set in its research.
The primary purpose of the National Neighborhood Crime Study (NNCS) was to assemble tract-level crime and sociodemographic data for cities across the United States in order to permit analyses of the sources of crime for "communities" of different racial-ethnic and class composition.