Brad,
First and foremost Thank You for this data and all the work you have done over the years and for the work that you continue to do. I had no idea that by opening this Thread I would create such insightful (yet confusing) discussion! Prior to now I never realized many of the complexities and pitfalls of Harvest Reporting...overlap of HIP inputs by waterfowl hunters who hunt multiple states, the fact that Waterfowl Hunters are a subset of Migratory Bird hunters mixed in with woodcock hunters, dove hunters, etc. (although there is a "Did not Hunt" checkbox--correct?)...also HIP input on duck harvest is actually based on "Where Licensed" not "Where Harvested".
My interest in this map arose when I compared Somerset County Pennsylvania (where I first hunted ducks as a teenager) vs. Richmond Virginia areas (where I now reside and occasionally hunt) vs. Eastern VA and Eastern NC where I have hunted the most. Also Texas and Arkansas...the data By County just didn't match my observations. Thanks to your clarifications I now understand the reasons for mismatch much better.
'Reminds me of a humorous book that I read many years ago when I was tasked with reducing the Failure Rates on Personal Computers for a major PC Manufacturer: https://en.wikipedia.org/wiki/How_to_Lie_with_Statistics. This job assignment was a great learning experience by which I learned to look at data with a very jaundiced eye and to do the best you can with data inputs that are not 100% "clean".
Thanks again,
Dave