An Exact Test on the Goodman–Kruskal λ for Prediction on a Dichotomy
二分类预测中 Goodman–Kruskal λ 的精确检验AI 解读 ↓
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Summary Goodman and Kruskal (1954) introduced a measure λ of predictive association when predicting the category of a variable B from a category of a variable A. The measure λ is such that 0 ≤ λ ≤ 1 with a zero value meaning no predictive gain while λ = 1 indicates a perfect predictive association between A and B. Thus, the test of H 0: λ = 0 versus H 1: λ > 0 is of prime importance, since it is entirely analogous to a test for significance of regression or correlation. We present an exact test, developed through a reparameterization scheme, of the above hypothesis when B is dichotomous. The testing procedure is quite simple, requiring few calculations. In addition, this paper presents the method of calculation of power for any point in the resulting parameter space and relates the power to the original parameter λ.