chi-square test
type: Concept
narrower: phi coefficient

methods
type: Collection
type: ConceptGroup
member: phi coefficient

correlation
type: Concept
narrower: phi coefficient

phi coefficient
type: Concept
broader: correlation
broader: chi-square test
definition: a variant of Pearson's correlation applied to two variables each of which takes one of two values which may be coded 1 or 2 (or any other pair of values for that matter). As such, its most common applications are in correlating two items on a questionnaire where the answers are coded yes or no (or as some other binary alternatives), and in circumstances in which a 2 x 2 chi-square would alternatively be employed. [Source: The SAGE Dictionary of Statistics; phi coefficient]