Word Frequencies

George Kingsley Zipf, "Frequency of Occurrence of Words in Plautus' Aulularia, Mostellaria, Pseudolus, and Trinummus," Selected Studies of the Principle of Relative Frequency in Language (Cambridge: Harvard University Press, 1932), pp. 31-51 (at 31):

Separate entries for homo and hominem (plus other oblique cases further down), faciam and facere, etc., are jarring to my pedantic mind, although I can understand why Zipf did it—he was counting syllables as well as words, after all. The statistics disconcert splitters (because of homonyms) as well as lumpers.