County Health Rankings & Roadmaps, A Healthier Nation, County by County

The County Health Rankings models and measures

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The County Health Rankings model of population health

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Key findings from the last four years of County Health Rankings and other national reports.

County-by-County Blog

Project updates, commentaries, events and news about health across the nation from the County Health Rankings & Roadmaps team.

Tue, 2010-02-02 22:33 -- Anonymous (not verified)

Some counties in the nation are too small to have reliable measurements for health outcome measures. Those counties are not ranked. If a county has data for enough measures to be ranked but is missing data for any individual measure, we assign the county the same value as the state mean for that measure. One way to overcome unstable and unreliable estimates due to small numbers, such as with the measures from the Behavioral Risk Factor Surveillance System (BRFSS), is to combine multiple years of data. This means that although the Rankings are useful for differentiating between places that are and are not healthy, they are not a good tool for setting objectives and tracking progress from year to year.

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