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NCJRS Abstract

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NCJ Number: 72293 Find in a Library
Title: Decisions and Data - The Transformation of Robbery Incidents Into Official Robbery Statistics
Author(s): R Block; C R Block
Corporate Author: IllinoisCriminal Justice Information Authority
Statistical Analysis Ctr
United States of America
Date Published: 1980
Page Count: 40
Sponsoring Agency: Ford Foundation
New York, NY 10017
IllinoisCriminal Justice Information Authority
Chicago, IL 60606
National Institute of Justice/
Rockville, MD 20849
US Dept of Health, Education, and Welfare
Rockville, MD 20852
US Dept of Health, Education, and Welfare
Washington, DC 20203
Grant Number: 1R01M27575
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America

IllinoisCriminal Justice Information Authority
Statistical Analysis Ctr
120 S Riverside Plaza
Chicago, IL 60606
United States of America
Document: PDF
Type: Statistics
Language: English
Country: United States of America
Annotation: This paper uses the secondary analysis of available data to estimate the transition probabilities of a hypothetical robbery case moving from incidence, to police notification, to police investigation and writing an initial report, to founding as an official robbery known to the police.
Abstract: Victim survey data and official survey data can be used in the same analysis. Victim survey and police samples are made comparable so that they contain noncommercial robbery incidents, not victimizations, occurring to Chicago residents within the city in 1974-75. Both citizens and the police make decisions as to whether a robbery incident should continue to become an official robbery statistic or whether it should be eliminated from the system. Thus, robbery data at a later step of the transformation process are systematically different from robbery data at an earlier step. A comparison of these data sets provides information about the decisions that must have produced them. The estimates of the transition possibilities of the hypothetical case suggest that (1) overall, about one-fourth of Chicago noncommercial robbery incidents become official robbery statistics; (2) neither citizen nor police decisions to eliminate a robbery from the system are random; and (3) the completion of the robbery as compared to the attempt only is the main factor in the victim's decision to notify the police. Conclusions about robbery incidents, therefore, should be based on incident data, while conclusions about founded robberies should be based on founded data. Footnotes, tables, and a bibliography of approximately 25 references are provided.
Index Term(s): Criminal justice statistics; Data analysis; Illinois; Property crime statistics; Statistical analysis
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