What are phi coefficients?
A) the correlation between two dichotomous variables
B) the correlation between two sets of test scores
C) the correlation between a test item and the total test score
D) they correlation of item difficulty and item bias

Question

Quizplus · Accepted Answer

Phi coefficients are used to measure the correlation between two dichotomous variables, meaning variables that have only two possible outcomes (e.g. yes/no, true/false). It ranges from -1 to 1, with 0 indicating no correlation and -1 or 1 indicating a perfect negative or positive correlation, respectively.

What Are Phi Coefficients