Abstract
Various statistical procedures have been applied in analyses of natural and experimental introgression. Most of these procedures can be derived from Welch's (1939) discriminant function, although most were developed independently prior to Welch's suggestion. Welch proposed that the use of the likelihood ratio criterion itself was the best allocation procedure for the case with two alternative classes. Fisher's (1936, 1938) discriminant function and weighted and unweighted hybrid indices can be obtained directly from Welch's discriminant function by applying various simplifying assumptions.
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