Point-Biserial and Biserial Correlations
the only mea surement available with whether the test was passed or failed. You could then use the biserial correlation to estimate the more meaningful product-moment correlation. The formulas used are found in Tate (1954, 1955), Sheskin (2011), and an article by Kraemer (2006). Technical Details Point-Biserial Correlation
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