Abacs for the Rapid Estimation of a Tetrachoric Coefficient From a Phi Coefficient Calculated From Use of Contrasted Groups

Guilford, J. P. Fundamental Statistics in Psychology and Education-New York: McGraw-Hill, 1950.

—. "The Phi Coefficient and Chi Square as Indices of Item Validity." Psychometrika, VI (1941), 11-19.

Hertzka, A. F. , Michael, W. B. , and Perry, N. C. "Systematic Error in Estimates of a Phi Coefficient." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT (in press).

Michael, W. B. , Perry, N. C. , and Guilford, J. P. "The Estimation of a Point Biserial Coefficient of Correlation from a Phi Coefficient Calculated from Use of Extreme Groups of Various, but Equal, Proportions." British Journal of Psychology : Statistical Section, V ( 1952), 139-50.

Michael, W. B. , Perry, N. C. , and Hertzka, A. F. "Systematic Error in Estimates of a Tetrachoric R." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XII (1952), 515-24.

Pearson, Karl. Tables for Statisticians and Biometricians. Part II. England: Cambridge University Press, 1931.

Perry, N. C. and Michael, W. B. "The Estimation of a Phi Coefficient for an Entire Criterion Group from a Phi Coefficient Calculated from Use of the Extreme Tails of a Normal Distribution of Criterion Scores." EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, XI (1951), 629-38.