Illinois Criminal Justice Cohorts: Criminal History and Recidivism Tool

The data analysis tool below has two distinct functions. The criminal history function can be used to obtain aggregate statistics on the prior criminal histories for persons entering and exiting the Illinois Department of Corrections (IDOC) or sentenced to probation. The recidivism function calculates the subsequent recidivism rates for persons released from IDOC or sentenced to probation. In order to provide meaningful results, the data are organized into three-year groupings (cohorts), beginning with 2000. Results for criminal history and recidivism events are calculated in two ways: 1) by a single overall measure (listed as "any offense type" in tables and charts) that only counts each person once; and 2) by non-mutually exclusive offense types (person, property, drug, violent sex, other).

Criminal History Function

The source of information on prior criminal history is the Illinois State Police Criminal History Record Information (CHRI) System and IDOC administrative records. Therefore, only events occurring in Illinois and successfully posted to these systems are available for statistical calculations in this tool. This tool allows the user to choose the particular starting point of interest (admission to prison,release from prison, or probation sentence) for any three-year range (cohort) starting from 2000. Results on the number of prior arrests, convictions, probation sentences and prison admissions will be displayed for a specified county or for Illinois as a whole.

Recidivism Function

Recidivism is defined in this tool as criminal justice events recorded for an individual in the Illinois State Police Criminal History Record Information (CHRI) System or IDOC administrative records after their release from the Illinois Department of Corrections (IDOC) or after a probation sentence date. Therefore, only events occurring in Illinois and successfully posted to these systems are available for recidivism calculations. The data allows for recidivism rates to be calculated for the following categories: subsequent arrests, convictions, new probation sentences and new prison admissions. The recidivism period is calculated from the selected cohort period through as far as June, 2013, unless otherwise limited by the user to the standard three years after release from IDOC or probation sentence date. The tool will not calculate recidivism for the Prison Admissions option (Step 1 below), as not all persons admitted during the selected cohort period will exit prison during the time frame allowed in the tool. Users should not compare official recidivism statistics produced by IDOC, the Administrative Office of Illinois Courts, or individual probation department reports to those returned by the tool due to differences in data systems and calculations.


Step 1 - Select a criminal justice population type:
        

Step 2 - Select either new court admissions or technical violator admissions (IDOC populations only):
(unless you are specifically interested in technical violators, most users should select new court admissions.
If prison exits are selected above, exits will be categorized by their admission type)
     

Step 3 - Select a three year cohort:

Step 4 - Select a county in Illinois or the whole state:

Step 5 - Select either criminal history or recidivism statistics to be returned for the above cohort:

Step 6 - Select a cohort grouping option. Recidivism and criminal history results will be separated for each group in the cohort.



Cohort Demographics

Demographic grouping Frequency Percent
0 100.00%
Total matched to ISP database 0 0.00%
Sex
Male 0 0.00%
Female 0 0.00%
Race/ethnicity
White 0 0.00%
Black 0 0.00%
Hispanic 0 0.00%
Other/unknown 0 0.00%
Admitting offense type
Person 0 0.00%
Property 0 0.00%
Drug 0 0.00%
Violent sex 0 0.00%
Other 0 0.00%
Admitting offense class
Class M and X 0 0.00%
Class 1 and 2 0 0.00%
Class 3 and 4 0 0.00%
Misdemeanor 0 0.00%
Other/unknown 0 0.00%
Violent/non-violent offense
Violent 0 0.00%
Non-violent 0 0.00%
0

Demographics Chart Control:




Arrest statistics

The arrest leading to a conviction for which a person is incarcerated for or sentenced to probation on is currently included as a prior arrest. Future updates will exclude these.

Selected cohort grouping Results
arrest offense type Total with any arrest Percent with any arrest Average number of arrests
Male Any offense type* 0 0.00% 0.00
Male
Person 0 0.00% 0.00
Male
Property 0 0.00% 0.00
Male
Drug 0 0.00% 0.00
Male
Sex (violent) 0 0.00% 0.00
Male
Other 0 0.00% 0.00
Female Any offense type* 0 0.00% 0.00
Female
Person 0 0.00% 0.00
Female
Property 0 0.00% 0.00
Female
Drug 0 0.00% 0.00
Female
Sex (violent) 0 0.00% 0.00
Female
Other 0 0.00% 0.00
White Any offense type* 0 0.00% 0.00
White
Person 0 0.00% 0.00
White
Property 0 0.00% 0.00
White
Drug 0 0.00% 0.00
White
Sex (violent) 0 0.00% 0.00
White
Other 0 0.00% 0.00
Black Any offense type* 0 0.00% 0.00
Black
Person 0 0.00% 0.00
Black
Property 0 0.00% 0.00
Black
Drug 0 0.00% 0.00
Black
Sex (violent) 0 0.00% 0.00
Black
Other 0 0.00% 0.00
Hispanic Any offense type* 0 0.00% 0.00
Hispanic
Person 0 0.00% 0.00
Hispanic
Property 0 0.00% 0.00
Hispanic
Drug 0 0.00% 0.00
Hispanic
Sex (violent) 0 0.00% 0.00
Hispanic
Other 0 0.00% 0.00
Other/Unknown Any offense type* 0 0.00% 0.00
Other/Unknown
Person 0 0.00% 0.00
Other/Unknown
Property 0 0.00% 0.00
Other/Unknown
Drug 0 0.00% 0.00
Other/Unknown
Sex (violent) 0 0.00% 0.00
Other/Unknown
Other 0 0.00% 0.00
Person Any offense type* 0 0.00% 0.00
Person
Person 0 0.00% 0.00
Person
Property 0 0.00% 0.00
Person
Drug 0 0.00% 0.00
Person
Sex (violent) 0 0.00% 0.00
Person
Other 0 0.00% 0.00
Property Any offense type* 0 0.00% 0.00
Property
Person 0 0.00% 0.00
Property
Property 0 0.00% 0.00
Property
Drug 0 0.00% 0.00
Property
Sex (violent) 0 0.00% 0.00
Property
Other 0 0.00% 0.00
Drug Any offense type* 0 0.00% 0.00
Drug
Person 0 0.00% 0.00
Drug
Property 0 0.00% 0.00
Drug
Drug 0 0.00% 0.00
Drug
Sex (violent) 0 0.00% 0.00
Drug
Other 0 0.00% 0.00
Sex (violent) Any offense type* 0 0.00% 0.00
Sex (violent)
Person 0 0.00% 0.00
Sex (violent)
Property 0 0.00% 0.00
Sex (violent)
Drug 0 0.00% 0.00
Sex (violent)
Sex (violent) 0 0.00% 0.00
Sex (violent)
Other 0 0.00% 0.00
Other Any offense type* 0 0.00% 0.00
Other
Person 0 0.00% 0.00
Other
Property 0 0.00% 0.00
Other
Drug 0 0.00% 0.00
Other
Sex (violent) 0 0.00% 0.00
Other
Other 0 0.00% 0.00
Class M and X Any offense type* 0 0.00% 0.00
Class M and X
Person 0 0.00% 0.00
Class M and X
Property 0 0.00% 0.00
Class M and X
Drug 0 0.00% 0.00
Class M and X
Sex (violent) 0 0.00% 0.00
Class M and X
Other 0 0.00% 0.00
Class 1 and 2 Any offense type* 0 0.00% 0.00
Class 1 and 2
Person 0 0.00% 0.00
Class 1 and 2
Property 0 0.00% 0.00
Class 1 and 2
Drug 0 0.00% 0.00
Class 1 and 2
Sex (violent) 0 0.00% 0.00
Class 1 and 2
Other 0 0.00% 0.00
Class 3 and 4 Any offense type* 0 0.00% 0.00
Class 3 and 4
Person 0 0.00% 0.00
Class 3 and 4
Property 0 0.00% 0.00
Class 3 and 4
Drug 0 0.00% 0.00
Class 3 and 4
Sex (violent) 0 0.00% 0.00
Class 3 and 4
Other 0 0.00% 0.00
Misdemeanor Any offense type* 0 0.00% 0.00
Misdemeanor
Person 0 0.00% 0.00
Misdemeanor
Property 0 0.00% 0.00
Misdemeanor
Drug 0 0.00% 0.00
Misdemeanor
Sex (violent) 0 0.00% 0.00
Misdemeanor
Other 0 0.00% 0.00
Violent Any offense type* 0 0.00% 0.00
Violent
Person 0 0.00% 0.00
Violent
Property 0 0.00% 0.00
Violent
Drug 0 0.00% 0.00
Violent
Sex (violent) 0 0.00% 0.00
Violent
Other 0 0.00% 0.00
Non-Violent Any offense type* 0 0.00% 0.00
Non-Violent
Person 0 0.00% 0.00
Non-Violent
Property 0 0.00% 0.00
Non-Violent
Drug 0 0.00% 0.00
Non-Violent
Sex (violent) 0 0.00% 0.00
Non-Violent
Other 0 0.00% 0.00
Any offense type* 0 0.00% 0.00
Person 0 0.00% 0.00
Property 0 0.00% 0.00
Drug 0 0.00% 0.00
Sex (violent) 0 0.00% 0.00
Other 0 0.00% 0.00
If a subgroup has fewer than 10 members, arrests are masked for the chosen grouping option.
The number of members in each subgroup can be found in the demographics tab.
*Any offense type refers to having at least one person, property, drug, violent sex, or other arrest event.
Cohort grouping:
Number type:

Conviction statistics

The conviction for which a person is incarcerated for is currently included as a prior conviction. Future updates will exclude these.

Selected cohort grouping Results
conviction offense type Total with any conviction Percent with any conviction Average number of convictions
Male Any offense type* 0 0.00% 0.00
Male
Person 0 0.00% 0.00
Male
Property 0 0.00% 0.00
Male
Drug 0 0.00% 0.00
Male
Sex (violent) 0 0.00% 0.00
Male
Other 0 0.00% 0.00
Female Any offense type* 0 0.00% 0.00
Female
Person 0 0.00% 0.00
Female
Property 0 0.00% 0.00
Female
Drug 0 0.00% 0.00
Female
Sex (violent) 0 0.00% 0.00
Female
Other 0 0.00% 0.00
White Any offense type* 0 0.00% 0.00
White
Person 0 0.00% 0.00
White
Property 0 0.00% 0.00
White
Drug 0 0.00% 0.00
White
Sex (violent) 0 0.00% 0.00
White
Other 0 0.00% 0.00
Black Any offense type* 0 0.00% 0.00
Black
Person 0 0.00% 0.00
Black
Property 0 0.00% 0.00
Black
Drug 0 0.00% 0.00
Black
Sex (violent) 0 0.00% 0.00
Black
Other 0 0.00% 0.00
Hispanic Any offense type* 0 0.00% 0.00
Hispanic
Person 0 0.00% 0.00
Hispanic
Property 0 0.00% 0.00
Hispanic
Drug 0 0.00% 0.00
Hispanic
Sex (violent) 0 0.00% 0.00
Hispanic
Other 0 0.00% 0.00
Other/Unknown Any offense type* 0 0.00% 0.00
Other/Unknown
Person 0 0.00% 0.00
Other/Unknown
Property 0 0.00% 0.00
Other/Unknown
Drug 0 0.00% 0.00
Other/Unknown
Sex (violent) 0 0.00% 0.00
Other/Unknown
Other 0 0.00% 0.00
Person Any offense type* 0 0.00% 0.00
Person
Person 0 0.00% 0.00
Person
Property 0 0.00% 0.00
Person
Drug 0 0.00% 0.00
Person
Sex (violent) 0 0.00% 0.00
Person
Other 0 0.00% 0.00
Property Any offense type* 0 0.00% 0.00
Property
Person 0 0.00% 0.00
Property
Property 0 0.00% 0.00
Property
Drug 0 0.00% 0.00
Property
Sex (violent) 0 0.00% 0.00
Property
Other 0 0.00% 0.00
Drug Any offense type* 0 0.00% 0.00
Drug
Person 0 0.00% 0.00
Drug
Property 0 0.00% 0.00
Drug
Drug 0 0.00% 0.00
Drug
Sex (violent) 0 0.00% 0.00
Drug
Other 0 0.00% 0.00
Sex (violent) Any offense type* 0 0.00% 0.00
Sex (violent)
Person 0 0.00% 0.00
Sex (violent)
Property 0 0.00% 0.00
Sex (violent)
Drug 0 0.00% 0.00
Sex (violent)
Sex (violent) 0 0.00% 0.00
Sex (violent)
Other 0 0.00% 0.00
Other Any offense type* 0 0.00% 0.00
Other
Person 0 0.00% 0.00
Other
Property 0 0.00% 0.00
Other
Drug 0 0.00% 0.00
Other
Sex (violent) 0 0.00% 0.00
Other
Other 0 0.00% 0.00
Class M and X Any offense type* 0 0.00% 0.00
Class M and X
Person 0 0.00% 0.00
Class M and X
Property 0 0.00% 0.00
Class M and X
Drug 0 0.00% 0.00
Class M and X
Sex (violent) 0 0.00% 0.00
Class M and X
Other 0 0.00% 0.00
Class 1 and 2 Any offense type* 0 0.00% 0.00
Class 1 and 2
Person 0 0.00% 0.00
Class 1 and 2
Property 0 0.00% 0.00
Class 1 and 2
Drug 0 0.00% 0.00
Class 1 and 2
Sex (violent) 0 0.00% 0.00
Class 1 and 2
Other 0 0.00% 0.00
Class 3 and 4 Any offense type* 0 0.00% 0.00
Class 3 and 4
Person 0 0.00% 0.00
Class 3 and 4
Property 0 0.00% 0.00
Class 3 and 4
Drug 0 0.00% 0.00
Class 3 and 4
Sex (violent) 0 0.00% 0.00
Class 3 and 4
Other 0 0.00% 0.00
Misdemeanor Any offense type* 0 0.00% 0.00
Misdemeanor
Person 0 0.00% 0.00
Misdemeanor
Property 0 0.00% 0.00
Misdemeanor
Drug 0 0.00% 0.00
Misdemeanor
Sex (violent) 0 0.00% 0.00
Misdemeanor
Other 0 0.00% 0.00
Violent Any offense type* 0 0.00% 0.00
Violent
Person 0 0.00% 0.00
Violent
Property 0 0.00% 0.00
Violent
Drug 0 0.00% 0.00
Violent
Sex (violent) 0 0.00% 0.00
Violent
Other 0 0.00% 0.00
Non-Violent Any offense type* 0 0.00% 0.00
Non-Violent
Person 0 0.00% 0.00
Non-Violent
Property 0 0.00% 0.00
Non-Violent
Drug 0 0.00% 0.00
Non-Violent
Sex (violent) 0 0.00% 0.00
Non-Violent
Other 0 0.00% 0.00
Any offense type* 0 0.00% 0.00
Person 0 0.00% 0.00
Property 0 0.00% 0.00
Drug 0 0.00% 0.00
Sex (violent) 0 0.00% 0.00
Other 0 0.00% 0.00
*Any offense type refers to having at least one person, property, drug, violent sex, or other conviction event.
Cohort grouping:
Number type:

Probation sentence statistics

Selected cohort grouping Results
probation sentence offense type Total with any probation sentence Percent with any probation sentence Average number of probation sentences
Male Any offense type* 0 0.00% 0.00
Male
Person 0 0.00% 0.00
Male
Property 0 0.00% 0.00
Male
Drug 0 0.00% 0.00
Male
Sex (violent) 0 0.00% 0.00
Male
Other 0 0.00% 0.00
Female Any offense type* 0 0.00% 0.00
Female
Person 0 0.00% 0.00
Female
Property 0 0.00% 0.00
Female
Drug 0 0.00% 0.00
Female
Sex (violent) 0 0.00% 0.00
Female
Other 0 0.00% 0.00
White Any offense type* 0 0.00% 0.00
White
Person 0 0.00% 0.00
White
Property 0 0.00% 0.00
White
Drug 0 0.00% 0.00
White
Sex (violent) 0 0.00% 0.00
White
Other 0 0.00% 0.00
Black Any offense type* 0 0.00% 0.00
Black
Person 0 0.00% 0.00
Black
Property 0 0.00% 0.00
Black
Drug 0 0.00% 0.00
Black
Sex (violent) 0 0.00% 0.00
Black
Other 0 0.00% 0.00
Hispanic Any offense type* 0 0.00% 0.00
Hispanic
Person 0 0.00% 0.00
Hispanic
Property 0 0.00% 0.00
Hispanic
Drug 0 0.00% 0.00
Hispanic
Sex (violent) 0 0.00% 0.00
Hispanic
Other 0 0.00% 0.00
Other/Unknown Any offense type* 0 0.00% 0.00
Other/Unknown
Person 0 0.00% 0.00
Other/Unknown
Property 0 0.00% 0.00
Other/Unknown
Drug 0 0.00% 0.00
Other/Unknown
Sex (violent) 0 0.00% 0.00
Other/Unknown
Other 0 0.00% 0.00
Person Any offense type* 0 0.00% 0.00
Person
Person 0 0.00% 0.00
Person
Property 0 0.00% 0.00
Person
Drug 0 0.00% 0.00
Person
Sex (violent) 0 0.00% 0.00
Person
Other 0 0.00% 0.00
Property Any offense type* 0 0.00% 0.00
Property
Person 0 0.00% 0.00
Property
Property 0 0.00% 0.00
Property
Drug 0 0.00% 0.00
Property
Sex (violent) 0 0.00% 0.00
Property
Other 0 0.00% 0.00
Drug Any offense type* 0 0.00% 0.00
Drug
Person 0 0.00% 0.00
Drug
Property 0 0.00% 0.00
Drug
Drug 0 0.00% 0.00
Drug
Sex (violent) 0 0.00% 0.00
Drug
Other 0 0.00% 0.00
Sex (violent) Any offense type* 0 0.00% 0.00
Sex (violent)
Person 0 0.00% 0.00
Sex (violent)
Property 0 0.00% 0.00
Sex (violent)
Drug 0 0.00% 0.00
Sex (violent)
Sex (violent) 0 0.00% 0.00
Sex (violent)
Other 0 0.00% 0.00
Other Any offense type* 0 0.00% 0.00
Other
Person 0 0.00% 0.00
Other
Property 0 0.00% 0.00
Other
Drug 0 0.00% 0.00
Other
Sex (violent) 0 0.00% 0.00
Other
Other 0 0.00% 0.00
Class M and X Any offense type* 0 0.00% 0.00
Class M and X
Person 0 0.00% 0.00
Class M and X
Property 0 0.00% 0.00
Class M and X
Drug 0 0.00% 0.00
Class M and X
Sex (violent) 0 0.00% 0.00
Class M and X
Other 0 0.00% 0.00
Class 1 and 2 Any offense type* 0 0.00% 0.00
Class 1 and 2
Person 0 0.00% 0.00
Class 1 and 2
Property 0 0.00% 0.00
Class 1 and 2
Drug 0 0.00% 0.00
Class 1 and 2
Sex (violent) 0 0.00% 0.00
Class 1 and 2
Other 0 0.00% 0.00
Class 3 and 4 Any offense type* 0 0.00% 0.00
Class 3 and 4
Person 0 0.00% 0.00
Class 3 and 4
Property 0 0.00% 0.00
Class 3 and 4
Drug 0 0.00% 0.00
Class 3 and 4
Sex (violent) 0 0.00% 0.00
Class 3 and 4
Other 0 0.00% 0.00
Misdemeanor Any offense type* 0 0.00% 0.00
Misdemeanor
Person 0 0.00% 0.00
Misdemeanor
Property 0 0.00% 0.00
Misdemeanor
Drug 0 0.00% 0.00
Misdemeanor
Sex (violent) 0 0.00% 0.00
Misdemeanor
Other 0 0.00% 0.00
Violent Any offense type* 0 0.00% 0.00
Violent
Person 0 0.00% 0.00
Violent
Property 0 0.00% 0.00
Violent
Drug 0 0.00% 0.00
Violent
Sex (violent) 0 0.00% 0.00
Violent
Other 0 0.00% 0.00
Non-Violent Any offense type* 0 0.00% 0.00
Non-Violent
Person 0 0.00% 0.00
Non-Violent
Property 0 0.00% 0.00
Non-Violent
Drug 0 0.00% 0.00
Non-Violent
Sex (violent) 0 0.00% 0.00
Non-Violent
Other 0 0.00% 0.00
Any offense type* 0 0.00% 0.00
Person 0 0.00% 0.00
Property 0 0.00% 0.00
Drug 0 0.00% 0.00
Sex (violent) 0 0.00% 0.00
Other 0 0.00% 0.00
*Any offense type refers to having at least one person, property, drug, violent sex, or other probation event.
Cohort grouping:
Number type:

Prison statistics

Selected cohort grouping Results
IDOC admission offense type Total with any IDOC admission Percent with any IDOC admission Average number of IDOC admissions
Male Any offense type* 0 0.00% 0.00
Male
Person 0 0.00% 0.00
Male
Property 0 0.00% 0.00
Male
Drug 0 0.00% 0.00
Male
Sex (violent) 0 0.00% 0.00
Male
Other 0 0.00% 0.00
Male
Technical Violation 0 0.00% 0.00
Female Any offense type* 0 0.00% 0.00
Female
Person 0 0.00% 0.00
Female
Property 0 0.00% 0.00
Female
Drug 0 0.00% 0.00
Female
Sex (violent) 0 0.00% 0.00
Female
Other 0 0.00% 0.00
Female
Technical violation 0 0.00% 0.00
White Any offense type* 0 0.00% 0.00
White
Person 0 0.00% 0.00
White
Property 0 0.00% 0.00
White
Drug 0 0.00% 0.00
White
Sex (violent) 0 0.00% 0.00
White
Other 0 0.00% 0.00
White
Technical violation 0 0.00% 0.00
Black Any offense type* 0 0.00% 0.00
Black
Person 0 0.00% 0.00
Black
Property 0 0.00% 0.00
Black
Drug 0 0.00% 0.00
Black
Sex (violent) 0 0.00% 0.00
Black
Other 0 0.00% 0.00
Black
Technical violation 0 0.00% 0.00
Hispanic Any offense type* 0 0.00% 0.00
Hispanic
Person 0 0.00% 0.00
Hispanic
Property 0 0.00% 0.00
Hispanic
Drug 0 0.00% 0.00
Hispanic
Sex (violent) 0 0.00% 0.00
Hispanic
Other 0 0.00% 0.00
Hispanic
Technical violation 0 0.00% 0.00
Other/Unknown Any offense type* 0 0.00% 0.00
Other/Unknown
Person 0 0.00% 0.00
Other/Unknown
Property 0 0.00% 0.00
Other/Unknown
Drug 0 0.00% 0.00
Other/Unknown
Sex (violent) 0 0.00% 0.00
Other/Unknown
Other 0 0.00% 0.00
Other/Unknown
Technical violation 0 0.00% 0.00
Person Any offense type* 0 0.00% 0.00
Person
Person 0 0.00% 0.00
Person
Property 0 0.00% 0.00
Person
Drug 0 0.00% 0.00
Person
Sex (violent) 0 0.00% 0.00
Person
Other 0 0.00% 0.00
Person
Technical violation 0 0.00% 0.00
Property Any offense type* 0 0.00% 0.00
Property
Person 0 0.00% 0.00
Property
Property 0 0.00% 0.00
Property
Drug 0 0.00% 0.00
Property
Sex (violent) 0 0.00% 0.00
Property
Other 0 0.00% 0.00
Property
Technical violation 0 0.00% 0.00
Drug Any offense type* 0 0.00% 0.00
Drug
Person 0 0.00% 0.00
Drug
Property 0 0.00% 0.00
Drug
Drug 0 0.00% 0.00
Drug
Sex (violent) 0 0.00% 0.00
Drug
Other 0 0.00% 0.00
Drug
Technical violation 0 0.00% 0.00
Sex (violent) Any offense type* 0 0.00% 0.00
Sex (violent)
Person 0 0.00% 0.00
Sex (violent)
Property 0 0.00% 0.00
Sex (violent)
Drug 0 0.00% 0.00
Sex (violent)
Sex (violent) 0 0.00% 0.00
Sex (violent)
Other 0 0.00% 0.00
Sex (violent)
Technical violation 0 0.00% 0.00
Other Any offense type* 0 0.00% 0.00
Other
Person 0 0.00% 0.00
Other
Property 0 0.00% 0.00
Other
Drug 0 0.00% 0.00
Other
Sex (violent) 0 0.00% 0.00
Other
Other 0 0.00% 0.00
Other
Technical violation 0 0.00% 0.00
Class M and X Any offense type* 0 0.00% 0.00
Class M and X
Person 0 0.00% 0.00
Class M and X
Property 0 0.00% 0.00
Class M and X
Drug 0 0.00% 0.00
Class M and X
Sex (violent) 0 0.00% 0.00
Class M and X
Other 0 0.00% 0.00
Class M and X
Technical violation 0 0.00% 0.00
Class 1 and 2 Any offense type* 0 0.00% 0.00
Class 1 and 2
Person 0 0.00% 0.00
Class 1 and 2
Property 0 0.00% 0.00
Class 1 and 2
Drug 0 0.00% 0.00
Class 1 and 2
Sex (violent) 0 0.00% 0.00
Class 1 and 2
Other 0 0.00% 0.00
Class 1 and 2
Technical violation 0 0.00% 0.00
Class 3 and 4 Any offense type* 0 0.00% 0.00
Class 3 and 4
Person 0 0.00% 0.00
Class 3 and 4
Property 0 0.00% 0.00
Class 3 and 4
Drug 0 0.00% 0.00
Class 3 and 4
Sex (violent) 0 0.00% 0.00
Class 3 and 4
Other 0 0.00% 0.00
Class 3 and 4
Technical violation 0 0.00% 0.00
Misdemeanor Any offense type* 0 0.00% 0.00
Misdemeanor
Person 0 0.00% 0.00
Misdemeanor
Property 0 0.00% 0.00
Misdemeanor
Drug 0 0.00% 0.00
Misdemeanor
Sex (violent) 0 0.00% 0.00
Misdemeanor
Other 0 0.00% 0.00
Misdemeanor
Technical violation 0 0.00% 0.00
Violent Any offense type* 0 0.00% 0.00
Violent
Person 0 0.00% 0.00
Violent
Property 0 0.00% 0.00
Violent
Drug 0 0.00% 0.00
Violent
Sex (violent) 0 0.00% 0.00
Violent
Other 0 0.00% 0.00
Violent
Technical violation 0 0.00% 0.00
Non-Violent Any offense type* 0 0.00% 0.00
Non-Violent
Person 0 0.00% 0.00
Non-Violent
Property 0 0.00% 0.00
Non-Violent
Drug 0 0.00% 0.00
Non-Violent
Sex (violent) 0 0.00% 0.00
Non-Violent
Other 0 0.00% 0.00
Non-Violent
Technical violation 0 0.00% 0.00
Any offense type* 0 0.00% 0.00
Person 0 0.00% 0.00
Property 0 0.00% 0.00
Drug 0 0.00% 0.00
Sex (violent) 0 0.00% 0.00
Other 0 0.00% 0.00
Technical violation 0 0.00% 0.00
*Any offense type refers to having at least one person, property, drug, violent sex, or other IDOC admission event.
**All IDOC admission types except technical violation admissions are for new sentence admissions only.
Cohort grouping:
Number type:

Frequently Asked Questions and Other Information

What are the sources of data in the tool?

The prison admission and exit cohorts were created from administrative files provided to ICJIA by the Illinois Department of Corrections (IDOC) Planning and Research Unit. The probation cohorts as well as recidivism and criminal history data on arrests, convictions, and probation sentences are from the Illinois State Police (ISP) electronic criminal history database. Recidivism and criminal history data on IDOC admissions are from the same files provided by IDOC that are used to create the cohorts.

Data definitions and methods

  • Prison admission: An individual entering a state correctional facility based on a new court sentence or a technical violation. An individual may have more than one admission of the same or different type within a single cohort time period. Each admission is counted.
    • New court admission: An individual entering a state correctional facility due to a guilty finding in criminal court.
    • Technical violation admission: An individual entering a state correctional facility due to a technical violation of their mandatory supervised release or parole. This technical violation may have been an arrest incident, but is not necessarily indicative of a criminal offense.
  • Prison exit: An individual exiting a state correctional facility based on a new court sentence or a technical violation. An individual may have more than one exit of the same or different type within a single cohort.
  • Probation Admission: An individual sentenced to probation in Illinois, defined as a court disposition in which the offender is allowed to remain in the community under the supervision of a probation officer for a specific time period and under certain conditions, as set forth by law and/or the court. An individual may have more than one probation sentence within a single cohort.
  • Criminal history: Criminal events for an individual prior to some event. For example, a person admitting to prison on a given date will have a criminal history consisting of arrests, convictions, probation sentences, and IDOC admissions prior to that admission date.
  • Recidivism: Criminal events for an individual after some event. For example, a person exiting prison on a given date will have recidivism consisting of arrests, convictions, probation sentences, and IDOC admissions after that exit date.
  • Arrest: An arrest occurs "if a peace officer has reasonable grounds to believe that a person is committing or has committed an offense." An arrest is counted if the individual was at least 18 years old and was fingerprinted for the arrest incident and submitted to the state police. If an arrest has multiple charges, the arrest is categorized by the most severe charge based on the offense class.
  • Conviction: A conviction occurs when a person charged with a crime is found guilty. All guilty counts are treated as separate convictions. For example, an arrest incident may involve a class 1 property crime and a class 4 drug crime charge. The arrest would be counted as a property arrest. If convicted for both, a conviction is included in the statistics for both the property and drug counts as long as both have a guilty disposition.
  • Probation sentence: A probation sentence is counted if the person is convicted and sentenced to probation, probation with special conditions, or intensive probation. If a person has the same probation sentence date for multiple convictions, it is counted only once and categorized by the most severe conviction offense.

How current are the data, and how far back does it cover?

The prison admission recidivism and criminal history events took place between July 1, 1988 and June 30, 2013. Any prison admissions prior to July 1, 1988 are not included in the criminal history statistics. Arrest, conviction, and probation sentence recidivism and criminal history events may be as current as June, 2013. There is no definitive minimum date for arrest, conviction, and probation sentence criminal history except for what is possible by age and if the arrest was ever entered into the state police database.

Why are some arrests masked as "10"?

An arrest is not in itself indicative of guilt and is not public record. Therefore, steps are taken to avoid the possible identification of individuals and/or particular arrests. ICJIA does not show arrest statistics for a cohort if the chosen grouping has at least one subgroup with fewer than ten (but not zero) members. For example, if data are grouped by sex and there are seven females in the cohort, the arrest statistics are masked for both males and females. Statistics for males are masked because it is mathematically possible to determine the masked statistic for females if the statistic for males were shown.

Why are the data grouped in three-year cohorts?

Three-year cohorts are used for two reasons. First, thee-year cohorts have roughly three times as many people in them as a single year cohort, and therefore it is less likely that arrests will need to be masked with a three year cohort. Second, it is possible that a given single-year cohort may be atypical in one year compared to most other years in terms of either cohort member characteristics, criminal history, or recidivism. By using three year cohorts, the atypical cohort year will be combined with two more-typical years and will diminish the outlier effect from the atypical year.

What was the match process for the state police data and the IDOC data?

The first name, last name, and date of birth in the IDOC files were used to match individuals in the IDOC data to the state police data. An exact match was used on all three criteria if possible. The vast majority of matches were exact. If an exact match could not be found, a partial match was checked on the first three letters of the last and first name being equal and the birth date being exactly equal. These partial matches were manually reviewed and included if ICJIA staff considered the match to be credible.

If a person could not be matched between the state police and IDOC data, are they used in the tool?

Unmatched person are included in the demographics output as well as the criminal history and recidivism statistics for IDOC admissions. In the demographics tab, the number and percent of the cohort matched is available in the table under "Total matched to ISP database." For arrest, conviction, and probation criminal history and recidivism statistics, the percent and average statistics are based on the number matched in the cohort, not the total cohort.

How are age and race determined?

Age and race for prison cohorts are determined from fields available in the IDOC administrative data. For probationers, Hispanic is not available and it is possible that a person will have more than one date of birth or race available on a fingerprint number. For each probationer sentenced cohort member, the most commonly occuring age and race were used. In the event of ties, the person was placed into the Other/Unknown category.
This data tool was supported in part by grants #2011-BJ-CX-K039 and #2012�BJ-CX-K013 awarded to the Illinois Criminal Justice Information Authority by the Bureau of Justice Assistance, Office of Justice Programs, U.S. Department of Justice. Data presented by this tool do not necessarily represent the official position or policies of the Authority, the Illinois Department of Corrections, or the U.S. Department of Justice.