Other correlation coefficients
Pearson product moment correlation coefficient (r) used when measuring two continuous variables
Spearman’s rho (ρ) – used with ordinal data (correlating two sets of ranks)
Biserial r – corr. between continuous variable and an artificial(reflect unlying continious scale forced into dicotomy dichotomous (2 levels-y/n,m/f, incorr/corr) variable. ie p/f test and gpa score.
Point biserial r – continuous and true (naturally form 2 categories, m/f) dichotomous variables. ie relationship bet gender & gpa score