# Tag for “number needed to treat” and “number needed to harm”?

I see we have no tag for number needed to treat or number needed to harm. Am I missing some tag synonym or should I create a new tag?

• We usually do not create new tags to anticipate questions: tags emerge from the keywords applied to existing questions. Are you suggesting there are questions that need such a tag? – whuber Nov 21 '17 at 20:01
• This search stats.stackexchange.com/… only yields 5 Qs so I am not sure such a tag is really needed. But I don't know much about epidemiology. – amoeba Nov 21 '17 at 20:06
• Well, I just asked such a question. It's not my area of expertise, but I suspect that there are other such questions. – Peter Flom Nov 21 '17 at 20:51
• If you asked a question about this subject and feel that a particular string would be a useful tag, then by all means apply the tag. That's how tagging is supposed to work and that's all it takes to create a new tag. – whuber Nov 21 '17 at 20:57
• There is an existing tag, it is named "nnt". It appears I created in in December '12. It currently has 2 threads. We could add @amoeba's 3 others, make it a synonym of your new tag, or just get rid of it. – gung - Reinstate Monica Nov 21 '17 at 21:14
• I don't know how I missed that. I think making it a synonym is best. – Peter Flom Nov 21 '17 at 21:30
• @PeterFlom, do you have a preference re which is the master tag? – gung - Reinstate Monica Nov 21 '17 at 21:47
• @gung I would suggest the long one. I think the fact that Peter overlooked the short one speaks for itself. – amoeba Nov 21 '17 at 22:08
• @gung I agree with Amoeba. – Peter Flom Nov 21 '17 at 22:35

There is was an existing tag named [nnt] (used in two questions). I made it a synonym of new tag and merged them.