This data set is from Google and Schema. It’s by county, not by state, yet quite a few states are clearly outlined in sharp relief. I would love to understand why. Why are Connecticut and Maine and Wisconsin clearly visible for high occurrence? What makes West Virginia so different from Virginia? Arizona from New Mexico? Wisconsin from Illinois? California from most of the rest of the country?
What’s going on here? You can look at the interactive results for a variety of diseases here. Depression shows state outlines in sharpest contrast. Why?
The data ends in 2003, and maybe that’s part of the issue?