1
Q
Pearson R
A
interval or ratio
interval or ratio
2
Q
Spearman rho
A
ordinal
ordinal
3
Q
Phi
A
true dichotomy (nominal)
true dichotomy (nominal)
4
Q
tetrachoric
A
artificial dichotomy
artificial dichotomy
5
Q
contingency coefficient
A
nominal (2 or more categories)
nominal (2 or more categories)
6
Q
point biserial
A
true dichotomy
interval or ratio
7
Q
biserial
A
artificial dichotomy
interval or ratio
8
Q
eta
A
curvilinear, interval or ratio
interval or ratio
