Statistical Test: Biserial r
Statistical Measure: Refer critical ratio for biserial r to a table of the unit normal curve
Notes: This measure depends on a strict assumption of the normality of the continuous variables that have been dichotomized. Furthermore, the sampling error is large when dichotomies are extreme. Nunnally (1978, pages 135-137) advises against the use of these coefficients. Biserial r: McNemar, Q. Psychological Statistics. Fourth edition. New York: Wiley 1969. p. 215; Nunnally, J. C. Psychometric Theory. Second edition. New York: McGraw-Hill, 1978. p. 135 Critical ratio test: McNemar, Q. Psychological Statistics. Fourth edition. New York: Wiley 1969. p. 217
Statistical Measure: Refer critical ratio for biserial r to a table of the unit normal curve
Notes: This measure depends on a strict assumption of the normality of the continuous variables that have been dichotomized. Furthermore, the sampling error is large when dichotomies are extreme. Nunnally (1978, pages 135-137) advises against the use of these coefficients. Biserial r: McNemar, Q. Psychological Statistics. Fourth edition. New York: Wiley 1969. p. 215; Nunnally, J. C. Psychometric Theory. Second edition. New York: McGraw-Hill, 1978. p. 135 Critical ratio test: McNemar, Q. Psychological Statistics. Fourth edition. New York: Wiley 1969. p. 217