Usage History of 'subtests'

The following chart shows how frequently 'subtests' appeared in printed materials over time. For example, the word 'subtests' occurred 4 times in books in 1816 and 18,816 times in 2008. From 1816 to 2008, the word 'subtests' was used a total of 581,179 times in books scanned by Google. See Reference: Google Ngram project.

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