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I keep writing dataset. Is that correct, or should I write data set?

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dataset for certain datasets; data set for any set for data in general. In specific contexts, a dataset needs to satisfy conditions to qualify as a dataset. Any set of any data can be called a data set, unqualified. –  Kris Jan 12 '12 at 10:27

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up vote 6 down vote accepted

As @mmyers notes, dataset does not appear in any dictionaries. However, there are 172 incidences in the Corpus of Contemporary American English, and all but a handful are in the “academic” section, representing formal academic writing. Its lack of appearance in dictionaries is probably because it is a fairly new coinage, the two examples from the Corpus of Historical American English are from 2001. Nothing from before then. Interestingly, the British National Corpus has 51 incidences, dating from the 1980s to the mid 1990s.

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Wiktionary says they are equivalent, but neither Merriam-Webster nor Dictionary.com has an entry.

Given that information, I guess I would classify dataset as technical jargon, but it's really not much of a jargon term. Any technical audience would have no problem with it; a non-technical audience should still easily understand its meaning.

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Is it possible that data set is written dataset for similitude with database? Has database ever been written as data base? –  kiamlaluno Aug 28 '10 at 21:55
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@kiamlaluno: Yes, indeed. Database books from the 1980s and back used to spell it "data base" all the time. –  CesarGon Jan 15 '11 at 18:42

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