Selecting Statistics

Statistical Test

Jaspen's coefficient of multiserial correlation

Statistical Measure

Do Fisher's r to Z transformation and refer the critical ratio of Z to a table of the unit normal curve

Notes

This is a biased estimator. Jaspen's coefficient is the product moment correlation between the interval variable and a transformation of the ordinal variable. The magnitude of this statistic is sensitive to the assumption of normality.

Jaspen's coefficient: Freeman, L. C. Elementary Applied Statistics for Students in Behavioral Science. New York: Wiley, 1965. p. 131

Fisher's Z transformation: Hays, W. L. Statistics for the Social Sciences. Second edition. New York: Holt, Rinehart, and Winston, 1973. p. 662; Harshbarger, T. R. Introductory Statistics: A Decision Map. New York: Macmillan, 1971. p. 395