REDUCING UNCERTAINTY

Reducing Uncertainty - Reducing the Margin of Error in the American Community Survey... Regionalization is a process of combining neighboring polygons into "regions" based on a set of goals. In this case the goals are to combine census tracts 1) with similar socioeconomic attributes and 2) so that overall estimate uncertainty is reduced. Joining tracts together increases the sample size and thus generally reduces the overall uncertainty on the estimates for the combined tracts. We continue to combine similar tracts until all the estimates in all the regions have met a data quality threshold.