Case-sensitive letter and bigram frequency counts from large-scale English corpora

Abstract

We tabulated upper-and lowercase letter frequency using several large-scale English corpora (~183 million words in total). The results indicate that the relative frequencies for upper-and lowercase letters are not equivalent. We report a letter-naming experiment in which uppercase frequency predicted response time to uppercase letters better than did lowercase frequency. Tables of case-sensitive letter and bigram frequency are provided, including common nonalphabetic characters. Because subjects are sensitive to frequency relationships among letters, we recommend that experimenters use casesensitive counts when constructing stimuli from letters.

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