Homicides in Chicago, 1965-1995

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.

本数据集收录了芝加哥警察局谋杀分析文件中，1965年至1995年期间每起谋杀案件的信息。针对受害者层面的文件第一部分，提供了受害者与加害者之间的关系、受害者或加害者是否曾犯下暴力或非暴力罪行、案件发生的时间和地点、所用武器类型、事件原因和动机、是否涉及毒品、酒精、帮派、儿童虐待或家庭关系、加害者是否被识别以及加害者死亡情况的相关数据。同时，也提供了每位受害者和加害者的人口统计学变量，如年龄、性别和种族。受害者层面的文件为每位受害者记录一条记录，每位受害者记录中包含最多五名加害者的信息。当单一加害者对五名受害者负责时，文件中包含五条受害者记录，而加害者的信息在每个记录中重复。第二部分，加害者层面的数据，旨在允许创建受害者层面的文件因加害者信息在每位受害者记录中的重复而无法准确制备的加害者率和风险评估。在创建加害者文件时，对加害者变量进行了重组，以确保每位已知的加害者与单一记录相关联。加害者层面的文件中的多数变量是受害者层面文件中变量的副本。加害者记录包含有关加害者的人口统计学信息，以及有关加害者首位受害者（或唯一受害者，如果只有一个）的人口统计学和关系信息，以及谋杀事件的信息。与受害者层面文件相同，关于谋杀事件的信息，如地点、武器或毒品使用情况均相同。在受害者层面数据中完全缺失加害者数据的情况下，加害者层面文件中不生成任何加害者记录。这两种文件中的地理变量包括人口普查区、社区区域、警察局辖区和警察区域。