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The tag has no Wiki and seems to be used for several different topics, e.g.

  • Bayesian risk
  • risk in finance applications such as Value at Risk (VaR)
  • epidemiology and accidents (human health risks)

(see the top few most upvoted questions here).

Should we write a Wiki for the tag and specify what it may and may not refer to?

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    $\begingroup$ I know very little of these topics, except a little bit about financial applications, so I am not volunteering. $\endgroup$ – Richard Hardy Jun 16 '16 at 19:13
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    $\begingroup$ The tag has been used 74 times, so it's just about feasible to do some kind of split, if that's the consensus. Did you pick up any sense of the relative numbers? $\endgroup$ – Glen_b -Reinstate Monica Jun 16 '16 at 23:28
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    $\begingroup$ We have a lot of ambiguous tags. Experience tells me that nothing happens about them until there appears a person who takes the responsibility and burden on themselves to do the whole sorting thing. We have had several such sortings, including some tags with several hundreds posts. Mostly though nobody is volunteering and nothing gets done; ambiguous tags remain ambiguous. Simply raising the issue on Meta does not tend to help at all (still, +1 and thanks for raising it). $\endgroup$ – amoeba says Reinstate Monica Jun 17 '16 at 0:52
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    $\begingroup$ @amoeba, I get it. I checked the top users of the tag, no one seems particularly active there, so perhaps getting their attention to this question would not help much either. $\endgroup$ – Richard Hardy Jun 17 '16 at 6:24
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I think for statistical questions, only when risk is an expected loss does it make sense to tag in a question. To enhance the browsing and tagging experience, it would be useful to rename risk to risk-function.

In the other settings, "risk" tends to be specific to the field and not of particular statistical interest. I would advocate for deleting the risk tag on questions where it is application specific as it is a conflicting use of terms. In some applied questions, people have gotten away with using a tag like finance or biostatistics, so that would seem a better option instead.

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    $\begingroup$ Would there be a way to rename the [risk] tag to make it obvious that it refers to the "expected loss" (or whatever you think is appropriate)? Maybe some adjective next to the "risk" noun? $\endgroup$ – amoeba says Reinstate Monica Jun 17 '16 at 0:31
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    $\begingroup$ @amoeba good thought. "risk-function" probably. $\endgroup$ – AdamO Jun 17 '16 at 0:33
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    $\begingroup$ I think renaming [risk] into [risk-function] should be part of this answer (rather than just a comment). Also, if you type "risk" here stats.stackexchange.com/tags you will see that there are actually 4 other tags containing "risk" in them. Relative-risk, absolute-risk, and risk-difference are all about biomedical applications and I am wondering if they should be merged into one single tag (but I don't know what name for it would be most appropriate). What is competing-risks, I don't know. In any case, I think we need to take these tags into account when deciding how to deal with risk. $\endgroup$ – amoeba says Reinstate Monica Jan 5 '18 at 23:08
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    $\begingroup$ @amoeba good points again; makes my suggestion a little less obvious... my subjective preference is RR, AR, and RD are better left as separate tags since they are very different (in my narrow field) in terms of modeling approaches, and I would say the same of competing risks. If they were to be merged, time-to-event would perhaps be the right grandfather. I shall edit the answer. $\endgroup$ – AdamO Jan 5 '18 at 23:43
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    $\begingroup$ OK, +1 for the first paragraph, but the 2nd paragraph does not agree with us having all these other tags for RR, AR, RD. I guess many questions from [risk] should be retagged into one of these tags. (BTW, if you know what "competing-risks" is, maybe you could provide a wiki excerpt for that tag?) $\endgroup$ – amoeba says Reinstate Monica Jan 5 '18 at 23:55
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    $\begingroup$ @amoeba i have made a first pass at a wiki entry for competing risks. $\endgroup$ – mdewey Jan 7 '18 at 16:10

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