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Educational and Psychological Measurement
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Tetra: A Fortran IV Program for Computing the Cosine-Pi Approximation to the Tetrachoric Correlation Coefficient

Gilbert Becker

University of Winnipeg

John Hilton

University of Winnipeg

Research design features relating to the use of a binary response format to measure a continuous latent variable and to the arbitrary dichotomization of graduated data are discussed in connection with the advantages and disadvantages inherent in the use of the tetrachoric correlation. A FORTRAN IV program for computing the cosine-pi approximation to the tetrachoric correlation is described, and the nature and extent of systematic error found in that approximation are summarized.

Educational and Psychological Measurement, Vol. 52, No. 1, 81-85 (1992)
DOI: 10.1177/001316449205200108
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