Data for: Categorizing community type for epidemiologic evaluation of community factors and chronic disease across the United States

The file “LEADclassificationbytract.csv” contains two variables: geoid, which refers to the 11-digit census tract ID that corresponds to the 2010 Census tract boundaries for the contiguous United States (source: 2010 Rural-Urban Commuting Area codes, United States Department of Agriculture); and Lead_classification_tract, which denotes the LEAD classification of community type for 72,539 census tracts. The values for this variable are: higher density urban, lower density urban, suburban/small town, rural, and undesignated.文件"LEADclassificationbytract.csv"包含两个变量：其一为geoid，指代对应美国本土2010年人口普查街区（census tract）边界的11位人口普查街区ID，数据来源为美国农业部2010年城乡通勤区代码；其二为Lead_classification_tract，代表72539个人口普查街区的社区类型LEAD分类，该变量的取值分别为：高密度城区、低密度城区、郊区/小城镇、农村以及未指定类别。