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Reexamination of anomalous data from an old study sheds new light on statistical learning theory and deterministic assumptions about human behavior. The generalization of W. K. Estes' original statistical learning theory was published by him and J. H. Straughan in 1954. It has come to be known as the "matching principle." The current authors change the model so that the constant Pi , which Estes and Straughan used to represent the probability of reinforcement, or proportion of reinforced trials, was replaced by the probability of response of Subject B for Subject A, and vice versa.