Understanding crime incidence statistics: why the UCR diverges from the NCS

1 Describing the Uniform Crime Reports and the National Crime Survey.- 2 Why the NCS and the UCR Crime Index Appear Discrepant as Indicators of Trends in Crime.- 3 The Importance of Nonuniformities in Measurement for the Appearance of Divergence.- 4 Summary and Conclusions.- Appendix A Crime-Specific NCS-UCR Comparability Problems.- Appendix B Some Sources of Measurement Variation in the National Crime Survey and Major Demographic Developments During the Decade of the Survey That May Have Affected Their Influence on the Data Series.- References.