| Noun | 1. | fourfold point correlation - an index of the relation between any two sets of scores that can both be represented on ordered binary dimensions (e.g., male-female) statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters distribution free statistic, nonparametric statistic - a statistic computed without knowledge of the form or the parameters of the distribution from which observations are drawn |