Record of American Democracy, State Level MCD-Group Data for IL

The Record of American Democracy (ROAD) data provide election returns, socioeconomic summaries, and demographic details about the American public at unusually low levels of geographic aggregation. The NSF-supported ROAD project spans every state in the country from 1984 through 1990 (including some off-year elections). These data enable research on topics such as electoral behavior, the political characteristics of local community context, electoral geography, the role of minority groups in elections and legislative redistricting, split ticket voting and divided government, and elections under federalism. Another set of files has added to these roughly 30-40 political variables an additional 3,725 variables merged from the 1990 United States Census for 47,327 aggregate units called MCD Groups. The MCD Group is a construct for purposes of this data collection. It is based on a merging of the electoral precincts and Census Minor Civil Divisions (MCDs). An MCD is about the size of a city or town. An MCD Group is smaller than or equal to a county and (except in California) is greater than or equal to the size of an MCD. The MCD Group units completely tile the United States landmass. This particular study contains the files for the State Level MCD Group Data for the state of Illinois. Documentation and frequently asked questions are available online at the ROAD Website. A downloadable PDF codebook is also available in the files section of this study.美国民主记录（Record of American Democracy, ROAD）数据集提供了美国民众的选举结果、社会经济概况与人口统计细节，其地理聚合粒度处于异常精细的水平。该由美国国家科学基金会（National Science Foundation, NSF）资助的ROAD项目，覆盖了1984年至1990年间美国的所有州（包含部分非大选年选举）。本数据集可支撑选举行为、地方社区语境的政治特征、选举地理学、少数群体在选举与立法重划选区中的作用、分裂选票投票与分立政府，以及联邦制下的选举等诸多议题的研究。 另有一组数据文件在原有的约30至40个政治变量基础上，新增了3725个变量，这些变量源自1990年美国人口普查，适配于47327个被称为MCD群组（MCD Groups）的聚合单元。 MCD群组是本次数据采集工作中的专属划分单元，其基于选举选区与人口普查次要民政分区（Census Minor Civil Divisions, MCDs）的合并构建而成。单个MCD的规模大致相当于一座城市或城镇。MCD群组的规模不大于县，且（除加利福尼亚州外）不小于单个MCD的规模。所有MCD群组单元完整覆盖了美国陆地领土。 本数据集包含伊利诺伊州的州级MCD群组数据文件。 相关文档与常见问题解答可通过ROAD官方网站在线获取，本数据集的文件板块中还提供了可下载的PDF格式代码本。