Uniform Crime Reporting Program Data: Police Employee (LEOKA) Data, United States, 2018

The Uniform Crime Reporting Program Data, Police Employee Data, 2018 file contains monthly data on felonious or accidental killings and assaults upon United States law enforcement officers acting in the line of duty. The Federal Bureau of Investigation (FBI) assembled the data and processed them from UCR Master Police Employee (LEOKA) data tapes. Each agency record in the file includes the following summary variables: state code, population group code, geographic division, Metropolitan Statistical Area code, and agency name. These variables afford considerable flexibility in creating subsets or aggregations of the data. Since 1930, the Federal Bureau of Investigation has compiled the Uniform Crime Reports (UCR) to serve as a periodic nationwide assessment of reported crimes not available elsewhere in the criminal justice system. Each year, this information is reported in four types of files: (1) Offenses Known and Clearances by Arrest, (2) Property Stolen and Recovered, (3) Supplementary Homicide Reports (SHR), and (4) Police Employee (LEOKA) Data. The Police Employee (LEOKA) Data provide information about law enforcement officers killed or assaulted (hence the acronym, LEOKA) in the line of duty. The variables created from the LEOKA forms provide in-depth information on the circumstances surrounding killings or assaults, including type of call answered, type of weapon used, and type of patrol the officers were on.

2018年统一犯罪报告计划警察雇员数据集文件包含月度统计数据，涵盖美国执法人员在履职期间遭遇的蓄意凶杀、意外致死及袭击事件。联邦调查局（FBI）从统一犯罪报告核心警察雇员（Law Enforcement Officers Killed or Assaulted, LEOKA）数据磁带中汇编并处理了本数据集。
该文件中的每条机构记录均包含以下汇总变量：州代码、人口分组代码、地理分区、都会统计区（Metropolitan Statistical Area, MSA）代码以及机构名称。这些变量为数据的子集构建与聚合分析提供了极强的操作灵活性。
自1930年起，联邦调查局便开始编制统一犯罪报告（UCR），旨在为刑事司法体系中其他渠道无法获取的报案犯罪情况提供周期性全国性评估资料。每年，该类信息以四类文件形式发布：1. 已知犯罪与逮捕破案情况报告；2. 被盗及追回财产报告；3. 补充凶杀报告（Supplementary Homicide Reports, SHR）；4. 警察雇员（LEOKA）数据。
警察雇员（LEOKA）数据提供了执法人员在履职期间遇害或遭受袭击的相关信息，该缩写即由此得名。从LEOKA报表生成的变量可提供遇害或受袭事件的详细背景信息，包括接警类型、作案武器类型以及警员的执勤巡逻类型。