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  • % of words shows how frequently the unigram or bigram is used relative to all other tokens in the corpus, for the given year shown. This lets you see how often a word is used relative to the size of the corpus, without having to worry about things like whether there are more books in 1850 than 1900.
  • % of texts gives the number of texts that use your search terms at least once as a proportion of the total number of texts published that year. Unlike "% of words," it will not be skewed by a single book that uses a word hundreds of times; however, it may be impacted by changing sizes.
  • Word count  plots the actual count of the searched word as the y-value for the plot.
  • Text count plots a count as the y-value for the plot that is computed in the following way: only those volumes in which the searched word actually occurs are counted for creating the plot. So, each such volume registers as only a single count. (The word "text" is being used interchangeably with the word "volume".)

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