Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Pennsylvania Sentencing Data, 1977, 1980, 1983 (ICPSR 8327) Pennsylvania Sentencing Commission 2. Changing Patterns of Homicide and Social Policy in Philadelphia, Phoenix, and St. Louis, 1980-1994 (ICPSR 2729) Zahn, Margaret A. 3. School Culture, Climate, and Violence: Safety in Middle Schools of the Philadelphia Public School System, 1990-1994 (ICPSR 2026) Welsh, Wayne N.; Jenkins, Patricia H.; Greene, Jack R.