Allow to specify quantile values for the whiskers of boxplots

[cristobaltapia]

Hi, I am a rather new user of StatsPlots.jl and Julia. Thanks a lot for this package! I was doing some boxplots where I would like to mark the whiskers at the 5% and 95% quantile values. However, I could not find a way to do so. Reading through the implementation it looks like it is only possible to define the range value. Would it be possible to allow to overload range so that it also accepts a tuple of values e.g. (0.05, 0.95) and use it to draw the whiskers instead if IQR * range? Or maybe accept a tuple of any two arbitrary values that should be used for the whiskers?

Thanks!

[BeastyBlacksmith]

Is JuliaPlots/StatsPlots.jl#440 implementing what you are looking for?

[cristobaltapia]

@BeastyBlacksmith yes! That is exactly what I was looking for. Hopefully it will get merged soon.

[cristobaltapia]

I just tested this PR but it is not quite what I was looking for. What JuliaPlots/StatsPlots.jl#440 implements is to modify the range of the box and add additional lines within the box, but what I would like to have is the possibility to define a custom value (or percentile) for the whiskers, i.e. the lines extending beyond the box.

[BeastyBlacksmith]

That might be what was in JuliaPlots/StatsPlots.jl#401 which @HenriDeh closed for some reason

[HenriDeh]

I closed because I got no reaction to the PR and I'm not using StatPlots anymore. I can reopen if you like, or you can make a new PR and copy the changes of JuliaPlots/StatsPlots.jl#401 that you want.

[cristobaltapia]

I actually implemented a solution myself in the meantime. I like JuliaPlots/StatsPlots.jl#401, however I think that it would be better to allow to specify the upper and lower quantiles for the whiskers independently (as done in matplotlib). However, to be honest, I have never used non-symmetric quantiles for this, so I don't know if this is really necessary. But since it is so defined in matplotlib, then there might be a use for it.