Table 1 Three data sources used in this study.

From: Detecting directional forces in the evolution of grammar: A case study of the English perfect with intransitives across EEBO, COHA, and Google Books

Corpus

Year

Size (words)

1. Early English Books Online (EEBO)

1473–1700

7.55 M

2. Corpus of Historical American English (COHA)

1810–2009

400 M

3. Google Books

1700–2000

468 B

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