When collecting data for analysis strange things happen that make their way into the dataset. Sometimes those strange things are mistakes and we try to get rid of them, other times, they really are part of the data and we have to deal with them.…

There are too many ways to tell the prisoner’s dillema story. The original is due to Tucker, a version memorialized in a handout dated May 1950, part of which I have transcribed below, as it is so hard to find.…