a reciprocal relation between two or more things

[ Syn: correlativity ]

a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation); what is the correlation between those two variables?

[ Syn: correlation coefficient , coefficient of correlation ]

a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other

[ Syn: correlational statistics ]