ICPSR Inter-university Consortium for Political and Social Research Homicides in Chicago, 1965–1995 Part 1: Victim-Level Data Carolyn Rebecca Block, Richard L. Block, and the Illinois Criminal Justice Information Authority ICPSR 6399 HOMICIDES IN CHICAGO, 1965-1995 (ICPSR 6399) Principal Investigators Carolyn Rebecca Block Illinois Criminal Justice Information Authority Richard L. Block Loyola University and the Illinois Criminal Justice Information Authority Fourth ICPSR Version October 1998 Inter-university Consortium for Political and Social Research P.O. Box 1248 Ann Arbor, Michigan 48106 BIBLIOGRAPHIC CITATION Publications based on ICPSR data collections should acknowledge those sources by means of bibliographic citations. To ensure that such source attributions are captured for social science bibliographic utilities, citations must appear in footnotes or in the reference section of publications. The bibliographic citation for this data collection is: Block, Carolyn Rebecca, Richard L. Block, and the Illinois Criminal Justice Information Authority. HOMICIDES IN CHICAGO, 1965-1995 [Computer file]. 4th ICPSR version. Chicago, IL: Illinois Criminal Justice Information Authority [producer], 1998. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1998. REQUEST FOR INFORMATION ON USE OF ICPSR RESOURCES To provide funding agencies with essential information about use of archival resources and to facilitate the exchange of information about ICPSR participants' research activities, users of ICPSR data are requested to send to ICPSR bibliographic citations for each completed manuscript or thesis abstract. Please indicate in a cover letter which data were used. DATA DISCLAIMER The original collector of the data, ICPSR, and the relevant funding agency bear no responsibility for uses of this collection or for interpretations or inferences based upon such uses. DATA COLLECTION DESCRIPTION Carolyn Rebecca Block, Richard L. Block, and the Illinois Criminal Justice Information Authority HOMICIDES IN CHICAGO, 1965-1995 (ICPSR 6399) SUMMARY: These datasets contain information on every homicide in the murder analysis files of the Chicago Police Department for the years 1965-1995. For the victim-level file, Part 1, data are provided on the relationship of victim to offender, whether the victim or offender had previously committed a violent or nonviolent offense, time of occurrence and place of homicide, type of weapon used, cause and motivation for the incident, whether the incident involved drugs, alcohol, gangs, child abuse, or a domestic relationship, if or how the offender was identified, and information on the death of the offender(s). Demographic variables such as the age, sex, and race of each victim and offender are also provided. The victim-level file contains one record for each victim. Information for up to five offenders is included on each victim record. The same offender information is duplicated depending on the number of victims. For example, if a sole offender is responsible for five victims, the file contains five victim records with the offender's information repeated on each record. Part 2, Offender-Level Data, is provided to allow the creation of offender rates and risk analysis that could not be accurately prepared using the victim-level file due to the repeating of the offender information on each victim record. Offender variables were reorganized during the creation of the offender file so that each known offender is associated with a single record. A majority of the variables in the offender-level file are replicas of variables in the victim-level file. The offender records contain demographic information about the offender, demographic and relationship information about the offender's first victim (or sole victim if there was only one), and information about the homicide incident. Information pertaining to the homicide incident such as location, weapon, or drug use are the same as in the victim-level file. In cases where the offender data were completely missing in the victim-level data, no offender records were generated in the offender-level file. The offender-level data do not contain information about the victims in these cases. Geographic variables in both files include the census tract, community area, police district, and police area. UNIVERSE: All homicides in the murder analysis files of the Chicago Police Department from 1965 through 1995. NOTE: (1) The codebooks, data collection instrument, and maps are provided as Portable Document Format (PDF) files. The PDF format was developed by Adobe Systems Incorporated and can be accessed using the Adobe Reader. Information on how to obtain a copy of the Adobe Reader is provided in the README file on the diskette version of this study and through the NACJD Website on the Internet. (2) Please refer to the victim-level codebook for a more extensive list of related publications for this data collection. EXTENT OF COLLECTION: 2 data files + machine-readable documentation (PDF) + SAS data definition statements + SPSS data definition statements EXTENT OF PROCESSING: REFORM.DATA/ REFORM.DOC/ UNDOCCHK.ICPSR/ DDEF.ICPSR/ MDATA.ICPSR DATA FORMAT: Logical Record Length with SAS and SPSS data definition statements Part 1: Victim-Level Data Part 2: Offender-Level Data File Structure: rectangular File Structure: rectangular Cases: 23,817 Cases: 26,030 Variables: 115 Variables: 77 Record Length: 206 Record Length: 135 Records Per Case: 1 Records Per Case: 1 RELATED PUBLICATIONS: Block, Carolyn Rebecca, and Antigone Christakos. "Major Trends in Chicago Homicide: 1965-1994" (Research in Brief). Washington, DC: United States Department of Justice. National Institute of Justice, 1995. Block, Richard L., and Carolyn Rebecca Block. "Space, Place, and Crime: Hot Spot Areas and Hot Places of Liquor-Related Crime." In John E. Eck and David Weisburg (eds.), CRIME PLACES AND CRIME THEORY. Crime Prevention Studies series. Monsey, NY: Criminal Justice Press, 1995. Block, Carolyn Rebecca, and Richard L. Block. "Street Gang Crime in Chicago" (Research in Brief). Washington, DC: United States Department of Justice. National Institute of Justice, 1995. Reprinted in Malcolm W. Klein, Cheryl L. Maxson, and Jody Miller (eds.), THE MODERN GANG READER. Los Angeles, CA: University of Southern California, 1995. CHICAGO HOMICIDE CODEBOOK CODING INSTRUCTIONS CODER'S GUIDE TO THE CHICAGO HOMICIDE DATASET Antigone Christakos Carolyn Rebecca Block July 23, 1997 1996 Illinois Criminal Justice Information Authority 120 South Riverside Plaza Chicago, Illinois 60606-8550 Originally printed by the authority of the State of Illinois March, 1996 Printing order number 96-073 100 copies ACKNOWLEDGMENTS This codebook contains coding instructions for all coding updated in 1994 and 1995 under a grant from the JOYCE FOUNDATION and with the cooperation and support of the CHICAGO POLICE DEPARTMENT and the ILLINOIS CRIMINAL JUSTICE INFORMATION AUTHORITY. We would like to thank Dr. Richard L. Block of Loyola University Chicago, Patrick Baldwin, Robert Weidner, Jonathon Harmening and Karen Ephraim for their hard work on the project. We would like to especially thank the Crime Analysis Unit of the Chicago Police Department for making our data collection possible and providing valuable assistance concerning coding questions. CONTENTS OVERVIEW: THE CHICAGO HOMICIDE DATASET . .1 History . .2 Data and Data Collection. .2 On the Nationally Archived Version. .6 Organization of this Codebook . .6 CHICAGO HOMICIDE CODEBOOK. .7 General Coding Instructions . .7 PART I : Variables Coded Directly from the MARs . .7 Case Identification. .7 Variable: HOMINEW . .7 Variable: RDNUMBER. .8 Date and Time Variables. .8 Variable: INJURYDA. .8 Variable: INJDAY. .8 Variable: INJTIME . .8 Variable: DEATHDAT. .8 Variable: DEATHTIM. .8 Multiple Victim/Offender Identification. .9 Variable: NUMVIC. .9 Variable: NUMOFF. .9 Demographic Codes, Victim. .9 Variable: VICSEX. .9 Variable: VRACE . .9 Variable: VICAGE. 10 Demographic Codes, Offender(s) . 10 Variable: OFN1SEX . 10 Variable: OFN1RACE. 10 Variable: OFN1AGE . 10 Variable: OFN2SEX . 10 Variable: OFN2RACE. 11 Variable: OFN2AGE . 11 Variable: OFN3SEX . 11 Variable: OFN3RACE. 11 Variable: OFN3AGE . 11 Variable: OFN4SEX . 11 Variable: OFN4RACE. 12 Variable: OFN4AGE . 12 Variable: OFN5SEX . 12 Variable: OFN5RACE. 12 Variable: OFN5AGE . 12 Prior Arrest Record, Victim and Offender(s). 13 Variable: VPRIREC . 13 Variable: VCAP. 13 Variable: PREOFN1 . 13 Variable: OFN1CAP . 13 Variable: PREOFN2 . 13 Variable: OFN2CAP . 14 Variable: PREOFN3 . 14 Variable: OFN3CAP . 14 Variable: PREOFN4 . 14 Variable: OFN4CAP . 14 Variable: PREOFN5 . 15 Variable: OFN5CAP . 15 Police Area, District and Beat . 15 Variable: AREA. 15 Variable: DISTRICT. 15 Variable: BEAT. 16 Location Variables . 16 Variable: LOCATION. 16 Geographic Location Where Body Was Found . 17 Variable: STNUM . 17 Variable: STDIR . 17 Variable: STREET. 17 Motive, Circumstance, Situation Codes. 18 Variable: CAUSFACT. 18 Variable: CAUSFAC2. 19 Variable: CIRCUM. 19 Variable: MOTIVROB. 20 Variable: MOTIVBUR. 20 Variable: MOTIVSEX. 21 Variable: UUW . 21 Variable: CHILDABS. 21 Variable: VICCRIME. 21 Variable: VICTINTR. 22 Relationship Codes . 22 Variable: VREL1 . 22 Variable: OREL1 . 23 Variable: VREL2 . 24 Variable: OREL2 . 25 Variable: VREL3 . 26 Variable: OREL3 . 27 Variable: VREL4 . 28 Variable: OREL4 . 29 Variable: VREL5 . 30 Variable: OREL5 . 31 Drug and Alcohol Involvement in Incident . 32 Variable: INTXUSED.