1831319 - Add percentage indicator to standard deviation in compare view

Status: NEW

(Tree Management :: Perfherder, defect)

Description

[Bas Schouten (:bas.schouten)]

Attachment: improved-stddev.png

Currently there is nothing in the compare view after the standard deviation, this creates the impression that the value of the stddev is in the same units as the mean. Which it isn't, this is both technically incorrect and very confusing.

I.e. currently when it says 10 +/- 20, for a value that is in ms, that implies 10 +/- 20ms, whereas what it means is 10ms +/- 20%. This can be mostly easily remedied by adding a % character.

Comment 1

[Randell Jesup [:jesup] (needinfo me)]

Also, the value currently is the standard deviation (in %). Is that correct to characterize as "+- NN%"? I assume it's 1 standard deviation; for +- I would tend to assume it's a wider range than 1 stdev - 2 or more likely 3 stdev's