I guessed which one was most popular (“1234”), but not the least. Most of all I was surprised by the shape of the curve of most popular to least popular PINs. I was also intrigued to see the use of heat maps (like the one at right), a technique I first learned about in the '80s as one of the more effective quick tests of a random number generator. Altogether a very nice analysis by Nick Berry at DataGenetics...
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