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18 J. Quantitative Criminology 1 (2002)

handle is hein.journals/jquantc18 and id is 1 raw text is: Journal of Quantitative Criminology, Vol. 18, No. 1, March 2002 (© 2002) Estimates of Repeat Victimization Using the National Crime Victimization Survey Lynn M. R. Ybarra1 and Sharon L. Lohr23 Many crime victims experience multiple victimizations over time. Estimating the rate of repeat victimization from a longitudinal survey, however, is difficult because individuals often have missing data for some of the interviews. We use data from the 1996-98 U.S. National Crime Victimization Survey to explore potential effects of missing data on estimated rates of repeat violent victimiza- tions in individuals. We introduce two algorithms for estimating repeat victimiz- ation rates, using logistic models to impute values for individuals who have partial data. These models are applied to estimate rates of repeat victimization for all violent crimes, and separately for crimes of domestic violence. Estimates show substantial sensitivity to the form of the model used. KEY WORDS: concentration of crime; imputation; longitudinal surveys; missing data; nonresponse; prevalence of crime. 1. INTRODUCTION Victimization rates have two components. Victimization prevalence estimates the probability that an individual will be a victim at least once during a specified time period. Concentration of crime deals with number of victimizations per person. Strategies for reduction of victimization rates may focus on either of these components either reducing the number of people who become victims, or reducing the incidence of subsequent vic- timizations among persons who have been victimized once. Persons who are victimized by crime, particularly violent crime, more than once are of special interest because they can shed light on important issues in crime prevention. 'Doctoral candidate, Department of Mathematics, Arizona State University, Tempe, AZ 85287-1804. 2Professor, Department of Mathematics, Arizona State University, Tempe, AZ 85287-1804. 3To whom all correspondence should be addressed; e-mail: sharon.lohr@asu.edu 0748-4518/02/0300-0001/0 © 2002 Plenum Publishing Corporation

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