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Variations in associative strength between letter-digit pairs were produced experimentally using a probabilistic paired-associate procedure. Each pair consisted of 1 of 4 letters and 1 of 4 digits. Ss were then given a series of triplets. Each triplet was a unique combination consisting of 2 of the 4 letters and 1 of the 4 digits. Ss were instructed to choose the letter that "best goes" with the digit on the basis of what they had learned. Choice behavior was related to the relative frequency of item pairings during learning using the Bradley-Terry model for pair comparisons. The model was found to fit best when associative strength of a letter-digit pair was defined as a power transformation of the relative frequency with which the digit was paired with the letter. These results parallel those found for wordassociation data and are consonant with a relative frequency interpretation of associative strength for intraverbal and referent-name associations.

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