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The Corpus of Contemporary American English (COCA) is composed of one billion words as of November 2021. [1] [2] [4] The corpus is constantly growing: In 2009 it contained more than 385 million words; [5] in 2010 the corpus grew in size to 400 million words; [6] by March 2019, [7] the corpus had grown to 560 million words.
The table also includes frequencies from other corpora. As well as usage differences, lemmatisation may differ from corpus to corpus – for example splitting the prepositional use of "to" from the use as a particle. Also, the Corpus of Contemporary American English (COCA) list includes dispersion as well as frequency to calculate rank.
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A corpus may contain texts in a single language (monolingual corpus) or text data in multiple languages (multilingual corpus).In order to make the corpora more useful for doing linguistic research, they are often subjected to a process known as annotation.
Some major pitfalls are the corpus content, the corpus register, and the definition of "word". While word counting is a thousand years old, with still gigantic analysis done by hand in the mid-20th century, natural language electronic processing of large corpora such as movie subtitles (SUBTLEX megastudy) has accelerated the research field.
The Bank of English totals 650 million running words. [1] Copies of the corpus are held both at HarperCollins Publishers and the University of Birmingham. The version at Birmingham can be accessed for academic research. The Bank of English forms part of the Collins Word Web together with the French, German and Spanish corpora.