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It's insane how enormous those clusters are, too. I found this map in a mediocre article on Atlanta. I mean, look at this. This is an insane amount of segregation: For the unaware, cluster analysis produces hotspots -the red zones- where the zone represents an area in which obesity statistically significantly high (according to the Getis-Ord Gi* statistic). The barrier here is 95% for orange and 99% certainty for red. The cold spots (blue zones) are the opposite. They represent the areas where obesity is significantly low. Grey means that there is that that area is not part of a cluster (i.e. the chance that it is, is lower than the required treshold).