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Ring Analysis - what geographic level is aggregated?

Question asked by sunnyacres65 on Mar 6, 2012
Latest reply on Mar 7, 2012 by sunnyacres65
I am conducting a ring analysis of 25 miles of a point.  The aggregations are way off, by 33%, compared to the Census Bureau employment numbers at the same radii.  I assume it has to do with the geographic aggregation level, but I can't find the documentation that states how a ring analysis is aggregated.  Can anyone help?  Is it by tract or block group????
Thanks much!