The date histogram facet is very useful, but does not collect variances or standard deviations, only averages.
Seems simple enough to add (see e.g. the statistical facet, though should probably use http://www.johndcook.com/standard_deviation.html instead); I'm just not sure if the best approach is to create yet another facet plugin, or add this to the existing facet and create a pull request?
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