It was actually put together prior to the Census 2010 as a predictor of which counties might have response issues based on scores across 12 variables. These 12 variables included housing indicators (percent renters, multi-units, crowded housing, lack of telephones, vacancy) and people indicators (poverty, not high school graduate, unemployed, complex households, mobility, language isolation). Other operational and demographic data were also included, such as race/ethnic distributions.
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