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Population-weighted centroid

Question asked by research93 on Jun 5, 2012
Latest reply on Aug 17, 2012 by dtschopp
I know this question has been asked and answered a number of times on this forum, but I'm still stumped when trying to apply the answers to my own data.

I'm trying to calculate the population-weighted centroid of the census blocks for my city.
The attribute table for the census block data includes the population for each census block.
I have been trying to use the mean center tool to calculate the population-weighted centroid, choosing:
- the census block layer as the input feature
- the census block population in the Weight Field
- the individual census blocks in the Case Field

But the results keep coming up with the geographic centroid, rather than the population-weighted centroid.  The census block population doesn't appear in the attribute field of the
new layer.
Obviously I am missing something: any help would be so very much appreciated.