I'm not sure what the right approach is in this case (and there are a few similar cases in other tags).
The tag pivot
seems to be being used for both 'pivotal quantities' and 'pivot tables' (as in Excel). The first use of it seems to have been related to pivotal quantities, but it's been used about equally for both.
As such, I think the 'find similar questions' use of tags is somewhat compromised, since half the 'pivot' hits you will get will be the other meaning.
Might it make more sense to set up 'pivotal-quantity' and 'pivot-table' tags and edit so that the two are separated (perhaps making pivot a synonym of one of them)?
That would, of course, involve editing the tags on the existing questions with the tag.
On the other hand, it's not a heavily used tag (11 times I think), so perhaps its okay to just leave it.
I'm not sure what the reasonable thing to do is, so I figured I'd ask.
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Edit: Taking into account @gung's concern about large scale changes to tags being disruptive, here's my plan:
1) Right now -
a) give the ~half-dozen questions that have the pivot
tag but aren't about pivotal quantities have the pivot-table
tag (thus changing only about five or six tags at once) [done]
b) make a tag wiki for pivot
to say it's for pivotal quantities and mentioning the existence of the pivot-table
tag [done]
c) make a tag wiki for pivot-table
[done]
(at this point, the tag situation is 'stable' in the sense that it's clear to users what to do, if somewhat imperfect)
--
In the future (if needed)
2) At some time later on -
a) make a pivotal-quantity
tag
b) make a tag-wiki for it
c) edit tags on the remaining ~5-6 posts to make it pivotal-quantity
d) edit the pivot
tag wiki to mention the use of the other two tags
e) reserve the pivot
tag for pivoting in the matrix calculation (Gaussian elimination etc) sense, and perhaps the pivot-element in quicksort sense, both of which have some relevance to statistics (but retaining the note about the other two tags)
OR
3) Alternative to (2) if pivot
becomes widely used and the matrix sense is needed -
a) make a pivot-element
tag
b) make a tag-wiki for it
c) edit tags on any pivot
posts that should have this tag instead
d) edit the pivot
tag wiki to also mention the use of the new tag
--
* Edit2: In carrying out stage 1, I struck the following quandary - This post is tagged as pivot
... and at first glance I had thought it was connected to pivot-tables
, but now I am not at all sure it is. In fact I can't work out how the term pivot
comes into it at all. Should it be retagged as some other kind of thing? [Fixed by @gung]