Beta-binomial distribution

The beta-binomial distribution is a type of probability distribution. It models how likely something is to happen based on how often it has happened in the past. For example, if you flip a coin five times and it comes up heads three times and tails two times, the beta-binomial distribution might say that it's more likely for the heads side of the coin to come up next time. It does this by combining two other distributions—the Beta Distribution and the Binomial Distribution—to calculate the probability.