The maps should be self-evident; if not, this explanation is offered:
Using data from Bert Vaux's dialect survey, we examine regional dialect variation in the continental United States. Each observation can be thought of as a realization of a categorical random variable with a particular parameter vector that is a function of location—our goal was to interpolate among these points in order to estimate these parameter vectors at a given location, making use of a combination of kernel density estimation and non-parametric smoothing techniques.There are over a hundred more maps from the project, which wordsmiths will enjoy exploring.
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