Monday, February 29, 2016

Scattered Dimples

Here is a bivariate, skewed distribution of finger wear and motion in taking a receipt from a gas pump in Greenfield, Indiana. Most wear is from fingers pushing down on the gas receipt as it exits the dispenser. There is some left-to-right variability in this placement, and many customers have dragged their fingers further downward to capture the receipt. This leaves an elongated, skewed pattern of wear from top-to-bottom. The dimpled surface of this pump also leaves the impression of a skewed scatterplot of individual points. We have seen wear patterns on gasoline pumps before.

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