Usage History of 'covariate'

The following chart shows how frequently 'covariate' appeared in printed materials over time. For example, the word 'covariate' occurred 10 times in books in 1938 and 17,902 times in 2008. From 1938 to 2008, the word 'covariate' was used a total of 278,513 times in books scanned by Google. See Reference: Google Ngram project.

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