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I've stumbled across what seems to be a (small) bug regarding the calculation of upvotes for specific tags. Sometimes (probably because of tag merging), a question will exhibit the same tag twice -- e.g., What's the difference between \newcommand and \newcommand*? is tagged with (one of these very likely was a before). Upvotes for answers to these questions will correctly be counted only once for the calculation of the "top users" (and potential tag badge earners) of this tag, but they will be counted twice in the tag upvote statistic of one's user profile. For example, compare the number of upvotes for top user Joseph Wright (186) with the upvotes on his user profile (214).

2 Answers 2

Reset to default
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Ah, good point. I removed all the duplicate tags across the SE 2.0 network just now.

We should probably change tag renaming and merging so it doesn't create duplicate tags on posts.

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  • @Jeff: There are still some duplicates, e.g. here.
    – lockstep
    Commented Feb 20, 2011 at 3:49
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    @lock that's really odd, ah wait I know.. if a tag exists in triplicate (or quadruplicate) on a question, it takes multiple runs.
    – Jeff Atwood
    Commented Feb 20, 2011 at 7:42
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    Jeff: it takes multiple runs - It's like Bibtex, then.
    – Charles Stewart
    Commented Feb 20, 2011 at 16:03
  • Not sure if it is direct related but in my profile on the candidate statistic page there is the beamer tag listed twice.
    – Martin Scharrer
    Commented Feb 22, 2011 at 14:27
  • @Jeff: after a merge we've got some questions with double {table} tag. Could you please run tag deduplication again? Thanks!
    – Stefan Kottwitz Mod
    Commented Mar 8, 2011 at 9:50
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    @stefan done, quite a lot of duplicates
    – Jeff Atwood
    Commented Mar 8, 2011 at 9:59
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    @stefan @jeff The dupes are fixed in a scheduled task, I just fixed the merge tag logic so it does not create dupes in the first place
    – Sam Saffron Mod
    Commented Mar 10, 2011 at 1:03
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It's not perfectly clear to me that it is exactly the same problem, but from meta.SO, Why are there questions with duplicate tags once in a while?, Jeff answers:

So the next time there's a duplicate tag problem, just flag one of them for moderator attention and we'll run the tag deduplicator page.

So if any moderators should happen to read this, ones who happen to know what the tag deduplicator page is, maybe they will know if it is the tool for the job or not.

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  • @Charles: Thanks for the link -- it seems that the calculation bug is a follow-up problem of duplicate tags, and that it can be resolved by using this "deduplicator".
    – lockstep
    Commented Feb 19, 2011 at 18:04
  • BTW, I'm out of votes for today (I spent some time reading old meta-questions).
    – lockstep
    Commented Feb 19, 2011 at 18:06
  • I flagged the "example question" for moderator attention.
    – lockstep
    Commented Feb 19, 2011 at 18:15
  • Well, I can't find it!
    – Joseph Wright Mod
    Commented Feb 19, 2011 at 19:02
  • @lockstep: I'm trying to find out where this function is. I'll report back if/when I do.
    – Joseph Wright Mod
    Commented Feb 19, 2011 at 19:25
  • I didn't find it yet as well.
    – Stefan Kottwitz Mod
    Commented Feb 20, 2011 at 1:57
  • @Joseph,Stefan: I'm guessing it is a developer tool and not a moderator tool.
    – Charles Stewart
    Commented Feb 21, 2011 at 9:22
  • @Charles: From what Jeff says, I guess it was available for the SO site itself, and not the newer ones. Hopefully the situation can be dealt with properly by altering the back-end to prevent duplicate tags in the first place.
    – Joseph Wright Mod
    Commented Feb 21, 2011 at 12:49

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