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. 2012 Dec 10;2:943. doi: 10.1038/srep00943

Figure 5. Literary productivity and vocabulary size in the Google Inc. 1-gram dataset over the past two centuries.

Figure 5

(A) Total size of the different corpora Nu(t|Uc) over time, calculated by using words that satisfy ui(t) ≥ Uc ≡ 16 to eliminate extremely rare 1-grams. (B) Size of the written vocabulary Nw(t|Uc) over time, calculated under the same conditions as (A).