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Are precision dice fair? A statistical analysis

Posted By: Frank Berger
Date: Wednesday, 15 April 2026, at 12:16 p.m.

In Response To: Are precision dice fair? A statistical analysis (Francesco)

Very interesting. 2 pennies I have to add:

"precision dice" I once ordered Bescon "precision" dices, because they were cheap and when I wanted to put them in a box they fitted only when I have the last dice in a certain direction. Huh? Precision should mean orientation doesn't matter! So I took a caliper and found out that the smallest side differs more than 1 mm from the largest side for an 14.3 mm dice! I associate precision with other values.

I bought a pair of GO dices. If you don't know them: these dice are small electronic devices telling which side is up by bluetooth (the idea was to use BGBlitz and roll a physical dice). I expected them to be "loaded" because I can't imagine that the printed circuit board and so on is balanced, so I tested them. As Franceso will probably confirm :) a pretty boring task. I lost my notes but after about 800 rolls the Chi-square for both die indicated they are fair. 800 are a bit to few but nevertheless I wouldn't have any issues using them.

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