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Which is correct "criterion-based analysis" or "criteria-based analysis?" I have seen "criterion-referenced testing" and also "criteria-based assessment." I understand "criteria" is the plural and I think this is a compound adjective. So, as an adjective shouldn't "criterion" be invariable? I've seen academic writers use "criteria-based assessment" in scholarly research articles. Thank you for your replies.

  • Well, it would be correct if you're basing your analysis on a single criterion. Is that the case? – Azor Ahai Oct 3 '17 at 21:23
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    Would you say a child-based analysis or would you say a children-based analysis? – tchrist Oct 3 '17 at 23:11
  • I'm ready, willing and able to concede this as a lost cause in the US. Google Scholar seems to show about 3:1 in favor of "criteria-based" when I attempt to remove the most common collocations associated with the hyphenless forms. That results in about half with hyphens, and many of the non-hyphenated hits are still relevant. Try {"criteria-based" -on} for instance. You run the distinct risk of being a page into reading the paper and having people still puzzling over your title. – Phil Sweet Oct 5 '17 at 2:02
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I would prefer "criterion-based" (just as I prefer "rule-based" to "rules-based"). To me, there doesn't seem to be any good reason to prefer "criteria-based": I think the context makes it fairly obvious that "criterion-based" could refer to something based on more than one criterion. But other people might have different opinions. I'm talking about "preferences" and "opinions" because if "criteria-based" is used by good writers in the relevant field, it seems pedantic to call it "incorrect".

"Criterion-based" seems to be more common than "criteria-based" in American English

I searched the Corpus of Contemporary American English (COCA) and found "criterion-based" to have a frequency of 41, vs. "criteria-based" which only had a frequency of 7. All 41 examples of "criterion-based" came from an academic context, so it's not just a colloquialism.

I took a look at the collocates, and the only one where criteria-based was more common than criterion-based in the COCA corpus was with the word "selection", and that was only based on four examples of criteria-based used with "selection" vs. no examples of criterion-based used with "selection". (Google Books provides a number of examples of "criterion-based selection", so it isn't actually nonexistent.) With all other common collocates (such as "was", "strategies", "content", "assessment", "development", "performance", "test"), criterion-based was more common. My overall intepretation of this data would be that, in American English, criterion-based is more common than criteria-based in academic contexts; there are no clear differences in meaning and no contexts where the latter is clearly preferred.

(I haven't been able to get data that I trust from the Google Ngram Viewer because I'm somewhat uncertain about when it's interpreting the character - as a hyphen vs. as a minus sign. Regardless, none of the charts I saw when I was fiddling around with it showed "criteria-based" as being more frequent than "criterion-based" in either American or British English.)

Plural forms can be used in compound words; it's uncommon but not always incorrect

As you observe, nouns used as the first element of compounds in English are often invariant for grammatical number, taking the form of the singular. This is evident not only in the formation of compound adjectives, but also in the formation of compound nouns, or the use of the "attributive noun" construction (a noun placed before and used to modify the meaning of another noun).

However, it is not absolutely impossible for an attributive noun, or for a noun serving as the first element of a compound adjective, to be in the plural form.

The most uncontroversial examples are probably certain pluralia tantum where singularizing the word would give another word with a different meaning. Clothes are hung on a "clothes line", not on a "cloth line"; glasses are stored in a "glasses case" (or "eyeglass case"), not in a "glass case".

There is also a tendency, although not as strong, to use plural forms attributively for some other pluralia tantum. The singular form of "scissors" has no other meaning, and we do see "scissor" used as an attributive form or in compound adjectives, but some people use "scissors" in these contexts. So, there is variation between "scissors kick" and "scissor kick". Likewise, there is some variation between "pant leg" and "pants leg".

Shosht, in the comments, brought up another example that seems particularly relevant: "results-based" ("result-based" also exists, but seems to be less common).

Speakers sometimes allow things with irregular plurals that aren't normally allowed with regular plurals

There is apparently also an effect whereby irregular plural forms are more tolerated than regular plural forms as attributive nouns, although it doesn't seem overwhelmingly strong to me (see the examples "teeth-marks" and "mice-infested" in the following question: Irregular plurals in noun adjuncts, and the references to the literature discussing these examples).

A similar question, Grammatical number of Latin nouns used attributively before other nouns, provides the examples of multistrata cakes and multimedia ___.

I also think it's relevant to mention that, from a certain pedantic point of view, it could be considered "incorrect" to use any of the following words as singular nouns, since they are plural in Latin: agenda, data, stamina, media, insignia. People often disregard this and use them as singular anyway. (The specific patterns and histories of singular usage are different for each word, but my point is that rules can only tell you so much about matters of "correctness" for this kind of thing.) It seems likely to me that this is a large part of the explanation for the use of "data set" instead of "datum set", but that could also possibly be compared to the compound that you asked about. The use of "criteria" as a singular noun is currently not very common and not generally accepted, but it is apparently common enough at least for some sources to warn against this usage (see "criteria / criterion", Common Errors in English Usage), so there might be some small connection, at least for some people, between the nonstandard use of "criteria" as a singular noun and the use of "criteria-based". (For more on the grammatical number of "criteria", see “Criteria” versus “criterion”)

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You said it yourself:

I understand "criteria" is plural.

If the assessment of which you speak is considering (or factoring in) multiple criteria, "criteria-based" is correct. If the assessment is using only one criterion, then "criterion-based" is correct.

The question you should be asking, therefore, is "How many criteria are the basis of the assessment?" If the answer is one, use criterion-based; if two or more, use criteria-based.

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    Look up the relative number of Google hits for 'families-oriented' as opposed to 'family-oriented'. This answer is far too simplistic. And lacking in research. – Edwin Ashworth Oct 3 '17 at 21:42
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    @EdwinAshworth: My answer may be simplistic, but sometimes that's what is needed. I answered the OP's question in the most direct, succinct and, situationally speaking, correct way. Given the OP's reputation score, I think I made the right call. Sorry you disagree. Don – rhetorician Oct 4 '17 at 0:47
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    @EdwinAshworth, why is "family-oriented" the relevant standard here? How about "rule-based" vs "rules-based"? Google ngram indicates "rules-based" is far more common. An ngram search for "criteria-based" vs "criterion-based" 1980-2008 shows that "criteria-based" is widely used, especially in British books. – Shosht Oct 4 '17 at 2:54
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    @sumelic, I would happily, if someone would point me to an explanation of how to do it. My attempt using [] () failed. (Google inserts spaces before & after the hyphen for you, to comply with its formatting requirements, when you enter a hyphenated term.) EDIT: I meant "results-based," not "rules-based." – Shosht Oct 4 '17 at 3:02
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    @Shosht I didn't say that ' "family-oriented" [is] the relevant standard here'. I pointed out by using a counterexample that 'If the assessment of which you speak is considering (or factoring in) multiple criteria, "criteria-based" is correct. If the assessment is using only one criterion, then "criterion-based" is correct.', which seems to suggest that both forms are equally idiomatic, needs supporting evidence. I'm not saying that the huge preference for 'family-oriented' when obviously many families are being referenced demands that 'criteria-based' is unidiomatic. I'm asking for evidence. – Edwin Ashworth Oct 4 '17 at 7:13

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