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NCJRS Abstract

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NCJ Number: 147958 Find in a Library
Journal: Journal of Criminal Justice  Volume:22  Issue:1  Dated:(1994)  Pages:63-70
Author(s): M A Greene; P B Hoffman; J L Beck
Date Published: 1994
Page Count: 8
Type: Report (Technical Assistance)
Format: Article
Language: English
Country: United States of America
Annotation: This paper's purpose is to demonstrate that the Mean Cost Rating (MCR), a particularly useful statistic for measuring the accuracy of instruments used to predict recidivism, actually is a special case of the statistic called Somers' D.
Abstract: Somers' D, normally used to measure concordance in a contingency table, is reported on the output of commonly used statistical packages. Consequently, researchers who wish to use the MCR can obtain this statistic without any special programming or time-consuming hand calculations. However, some caution must be used in obtaining the MCR from a statistical package, because Somers' D has two forms. In one form, the rows are the independent variable; in the other, the columns are the independent variable. The MCR is the form of Somers' D that is opposite to what might be expected. (Author abstract modified)
Main Term(s): Crime Statistics
Index Term(s): Criminality prediction; Recidivism; Testing and measurement
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