Racial isolation values based on the 2000 census block group level using the 2000 census boundaries

These data contain a residential isolation value for non-Hispanic blacks (NHB) and non-Hispanic whites (NHW) at the census block group level. Population counts from the 2000 census are used to calculate the index. For each block group, the index is the proportion of the population (NHB or NHW) in the index block group and block groups adjacent to the index block group. Islands (areal units with no first-level adjacent areal units) are removed as it is not possible to calculate isolation for units with no adjacent block groups.

本数据集包含普查街区组（census block group）层面上的非西班牙裔黑人（non-Hispanic blacks, NHB）与非西班牙裔白人（non-Hispanic whites, NHW）的居住隔离指数（residential isolation value）。计算该指数所采用的人口数据源自2000年人口普查的人口计数结果。针对每个普查街区组，该指数为目标街区组及其相邻街区组内的非西班牙裔黑人或非西班牙裔白人的人口占比。由于无相邻街区组的单元无法计算隔离指数，因此移除了孤岛式面状单元（islands，即无一级相邻面状单元的区域）。