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@waffles Ah, the flag weight was dropped so recently? In any case, I would also investigate flagging frequency relative to prior flag weight, or, more simply, the proportion of flags created by low versus high weight users. Time will tell, of course.
Really, no offense intended, but that plot is not a very good way to determine if there is a change. It has weekly cycles, for a total of 12 weeks, and some of those overlap with some major holidays (Thanksgiving, Christmas, and New Year's). I could go on, but would love to just see the raw data. Perhaps it could be posted to stats.SE? :) I don't have a high flag weight on meta.SE, so the mods might never take of that. Couldja do that for me? :D