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There seems to be a fair amount of redundancy in the tags containing imputation in them. As of this writing, I observe the following distribution of imputation tag usages:

  • data-imputation: 160

  • multiple-imputation: 617

  • imputation: 4

Clearly multiple imputation is just one (very popular) variety of imputation, so perhaps we only need the tags imputation and multiple-imputation. To me, data-imputation appears to be somewhat redundant: I don't know what one would impute if not data!

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    $\begingroup$ The easiest solution is to manually change 4 instances of [imputation] to [data-imputation]; the empty tag will disappear after one day. No moderator action is needed for that, which is a big advantage (moderators here are often reluctant to proceed with any tag changes, AFAIK partially because those cannot easily be reversed). $\endgroup$ – amoeba Aug 19 '15 at 15:09
  • $\begingroup$ @amoeba Thanks for the tip! I was concerned that "going rogue" and doing so without attempting to reach consensus among other CV users would be frowned upon. I'll hold off until others have had a chance to weigh on. $\endgroup$ – Sycorax Aug 19 '15 at 15:16
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    $\begingroup$ Note that creating a tag does not require any "consensus" whatsoever, and once a tag is created it is likely to be used every now and then. Therefore I would argue that tidying up minor tags does not necessarily require a discussion either; of course any large-scale changes should be discussed. $\endgroup$ – amoeba Aug 19 '15 at 16:31
  • $\begingroup$ I wanted to look at the 4 questions with the imputation tag and realized that there are none: [imputation] is a synonym of [data-imputation] (since 2013) and if you try to look at these 4 questions you get redirected to the data-imputation with 160+4=164 questions... Looks confusing to me, but I guess that's how synonyms work on SE. $\endgroup$ – amoeba Aug 26 '15 at 23:25
  • $\begingroup$ Update: I read this FAQ meta.stackexchange.com/questions/70710 about synonym tags. It seems that if we edit these 4 questions in any way, then the tag will be automatically replaced by the "master" tag (and again, if no questions with [imputation] are left, it will disappear). Alternatively, a moderator can "merge" these two tags, leading to the same effect. At the moment they are not "merged", but are simply synonyms. $\endgroup$ – amoeba Aug 26 '15 at 23:30
  • $\begingroup$ Current situation looks fine in that if you choose "imputation" as a search tag, you get redirected to all the "data-imputation" questions, and if you begin to add imputation as a tag to a question, you see that "data-imputation" predominates. $\endgroup$ – tim Sep 1 '15 at 9:54
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we only need the tags [imputation] and [multiple-imputation]. To me, [data-imputation] appears to be somewhat redundant

As I've already written in the comments above, is since 2013 a synonym of . However, it is a non-merged synonym, and that's why 4 questions that were originally taged with [imputation] still remain to be tagged with this (obsolete) tag. This can clearly be confusing, as demonstrated by your question. That's why I suggest to merge all our non-merged tag synonyms: Should all our non-merged tag synonyms be merged (or removed)?

I am posting this answer in order to draw attention to this merging issue.

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    $\begingroup$ I'll merge them soon if no-one comes up with a good reason not to. $\endgroup$ – Scortchi - Reinstate Monica Oct 28 '15 at 20:13
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    $\begingroup$ I've done it now. $\endgroup$ – Scortchi - Reinstate Monica Nov 2 '15 at 15:48
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    $\begingroup$ Looks like this issue is resolved! $\endgroup$ – Sycorax Nov 2 '15 at 19:37

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