HANDOUT 7.1


DIFFERENT KINDS OF CORRELATION COEFFICIENTS

Name of coefficient Uses

Pearson r Both variables are interval

(height with weight)

Point biserial 1 variable interval, other

nominal (weight with gender)

Biserial 1 variable interval, the other

dichotomized interval

(height in inches with weight

recorded as either light/heavy)

Tetrachoric Both variables are dichotomized

interval (height recorded as

short/tall correlated with weight

recorded as light or heavy)

Spearman's rho Both variables are ordinal (people

ranked in terms of height and

weight)

Phi Coefficient Both variables are nominal

(Gender and race correlated)


Handout 7.2

Handout 7.3

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