Usage History of 'covariates'

The following chart shows how frequently 'covariates' appeared in printed materials over time. For example, the word 'covariates' occurred 4 times in books in 1943 and 28,709 times in 2008. From 1943 to 2008, the word 'covariates' was used a total of 367,888 times in books scanned by Google. See Reference: Google Ngram project.

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