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Cross-Validation of the Iowa Offender Risk Assessment Model in Michigan, 1980-1982 (ICPSR 9236)

Principal Investigator(s):


These data were collected in an attempt to cross-validate the 1984 and 1985 versions of the Iowa model for assessing risk of offending while on parole by applying the model to a Michigan sample of male parolees over a follow-up period of two and one-half years. Different measures of predictors such as prior criminal history, current offense, substance abuse history, age, and recidivism on parole are available. The first file contains information on parolees such as demographic characteristics, drug use history, prior criminal history, risk scores, and parole history. The second file includes parolees' detailed criminal histories including the total number of violent and nonviolent felony arrests and dates, and charges and dispositions of each arrest with a maximum of eight arrests.

Access Notes

  • One or more data files in this study are set up in a non-standard format, such as card image format. Users may need help converting these files before they can be used for analysis.

  • These data are available to the general public.


DS0:  Study-Level Files
DS1:  Parolees File - Download All Files (1.7 MB)
DS2:  Crimes File - Download All Files (1.9 MB)

Study Description


Bradshaw, Richard Alfred. Cross-Validation of the Iowa Offender Risk Assessment Model in Michigan, 1980-1982. ICPSR09236-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1989.

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This study was funded by:

  • United States Department of Justice. Office of Justice Programs. National Institute of Justice (85-IJ-CX-0035)

Scope of Study

Subject Terms:   age, crime prediction, criminal histories, offenses, parole, parolees, recidivism, risk assessment, substance abuse

Geographic Coverage:   Michigan, United States

Time Period:  

  • 1980--1982

Date of Collection:  

  • 1985--1986

Universe:   Male parolees in the state of Michigan in 1980.

Data Types:   event/transaction data


Sample:   A random sample of 676 male parolees was selected from the population of 4,084 inmates released on parole by the Michigan Parole Department during calendar year 1980.

Data Source:

Michigan Department of Corrections (DOC) criminal files, and state police rap sheet records


Original ICPSR Release:  

Version History:

  • 2006-01-18 File CB9236.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.

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