title: Multiple statistical tests: Lessons from a d20.
abstract: Statistical analyses are often conducted with α= .05. When multiple statistical tests are conducted, this procedure needs to be adjusted to compensate for the otherwise inflated Type I error. In some instances in tabletop gaming, sometimes it is desired to roll a 20-sided die (or 'd20') twice and take the greater outcome. Here I draw from probability theory and the case of a d20, where the probability of obtaining any specific outcome is (1)/ 20, to determine the probability of obtaining a specific outcome (Type-I error) at least once across repeated, independent statistical tests.
authors.affiliation: Department of Psychology, Boston College, Chestnut Hill, MA, 02467, USA.
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Madan
keywords: error; probability; statistical analysis; statistical test