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Published online by Cambridge University Press: 01 January 2025
The widespread use of bi-serial r in item analysis makes a quick and accurate method of evaluating the formula desirable. Such a method is provided by homographs. Dunlap and Kurtz in their Nomograph No. 47 give a method of solving the better known statement of the formula, namely (1)
Dunlap, Jack W. and Kurtz, Albert K., Handbook of Statistical Nomographs, Tables, and Formulas. World Book Co. 1932, Yonkers, New York.