Intimate Partner Multiple Segment Analysis

Research Question 2: What violent offenses did intimate partners commit and where were the offenses committed?

This example uses NIBRS data to identify intimate partner relationships, the violent offenses committed by intimate partners, and the location at which the offenses were committed. Prior to the implementation of NIBRS, data were not available at the national level to address this question. NIBRS provides the level of detail about offender-victim relationships and the crime locations that are needed for this analysis.

The data files needed for this multiple segment analysis are from the file saved in the example of Intimate Partner Single Segment Analysis - Research Question 1 and the incident-level aggregated flat file produced in Preparing Individual File Segments For Detailed Analysis. The original data source for the single segment analysis was the 1999 NIBRS hierarchical data file's victim segment. This segment was saved as a separate file. This example uses the victim segment file that was modified and saved in the intimate partner single segment example.

The file saved in the single segment example contains the variable OVRRCD that was created to identify intimate partner relationships as a category of offender-victim relationship. This new variable distinguished intimate partner relationships from other categories of relationships and it is relied upon here to create the new variable IP_OVR. IP_OVR allows a separate examination of the various intimate partner relationships. In addition to creating IP_OVR for this research question, the new variable IPMSVOFF creates groupings of most serious violent offenses reported by victims where one of the offenders was an intimate partner. The resulting data file is then matched to the incident-level flat file to obtain the offense location data for the relevant incidents.

The method of analysis is a cross-tabulation table comparing, for each type of intimate partner relationship, the number and percentage of most serious violent offense committed at each offense location. Most serious violent offense and offense location are grouped variables. The total number of incidents evaluated for this example is 167,158. The total number of valid cases for this analysis is 166,668 after excluding missing data on intimate partner most serious violent offense, intimate partner offender-victim relationship, and offense location variables.

A majority of the most serious violent offenses committed against intimate partners in a reported incident occurred in a residence or home. With the exception of homosexual relationship, this is true for all categories of intimate partner relationships and all categories of most serious violent offense.

For intimate partner relationships reported as homosexual, 100% of the murders were committed in a residence. However, only 3 such incidents were reported. Non-sexual assaults were most likely to occur in a residence (81%), whereas rape and other sexual assaults were more likely to occur in a non-residential facility (48%) than a residence (29%). Only 1 intimate partner homosexual relationship robbery was reported and this occurred in a non-residential facility.

For boyfriend/girlfriend relationships, 72% of the murders, 80% of the sexual assaults, 56% of the robberies, and 78% of the other assaults occurred in a home or residence. For robberies in the relationships, the second most likely location was outdoors at 24%. For common-law spouses, 93% of the murders, 88% of the sexual assaults, 81% of the robberies, and 84% of the other assaults occurred in a home or residence.

For spouses, 78% of the murders, 90% of the sexual assaults, 52% of the robberies, and 87% of the other assaults occurred in a home or residence. For intimate partner robberies, the second most frequently reported location was a non-residential facility at 30% for ex-spouses, 93% of the murders, 82% of the sexual assaults, 54% of the robberies, and 77% of the other assaults occurred in a home or residence. As with spousal relationships, the second most frequently reported location for robberies by ex-spouses was a non-residential facility (31%).

Below is the table produced showing the most serious violent offense committed in intimate partner relationships by location of incident.

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