Usage History of 'confounder'

The following chart shows how frequently 'confounder' appeared in printed materials over time. For example, the word 'confounder' occurred 2 times in books in 1637 and 3,078 times in 2008. From 1637 to 2008, the word 'confounder' was used a total of 34,985 times in books scanned by Google. See Reference: Google Ngram project.

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