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I read about a concept called the "usage rate" (proposed by Juliand and Chang-Rodriguez). It's a method for calculating the frequency of a word in a corpus. What exactly is the "usage rate" and what is the formula for calculating a word's usage rate?

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How about just counting the number of occurrences of each word you're interested in? –  drammock Dec 28 '12 at 3:47
    
because I want to know more about the "usage rate" in a corpus. I edited the question to make it more explicit. –  stevendaniels Dec 28 '12 at 4:46
    
all the papers I've read just count up the tokens and then divide by corpus size, and scale it to a nice round number (usually 1000 or 1000000), so usage rate is words/thousand or words/million. –  drammock Dec 28 '12 at 18:04
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