An alternative derivation of Tryon's basic formula for the coefficient of domain validity or the coefficient of generalizability developed by Cronbach, Rajaratnam, and Gleser is provided: This derivation, which is also the generalized Kuder-Richardson coefficient, requires a relatively minimal number of assumptions compared with that in previously proposed approaches.
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References
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Cronbach, L. J., Rajaratnam, Nageswari, and Gleser, Goldine C. Theory of generalizability: A liberalization of reliability theory. British Journal of Statistical Psychology, 1963, 16, 137-163.
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