> ---------- Forwarded message ---------- > From: Dirk Hohndel <d...@hohndel.org> > To: Willem Ferguson <willemfergu...@zoology.up.ac.za> > Cc: Subsurface Mailing List <subsurface@subsurface-divelog.org> > Bcc: > Date: Tue, 12 May 2020 14:24:28 -0700 > Subject: Re: RFC: Statistics in Subsurface > > On May 12, 2020, at 12:41 PM, Willem Ferguson < > willemfergu...@zoology.up.ac.za> wrote: > > ....snip......
> Lastly, I do not like candlestick graphs because the application in > econometrics does not include the equivalent of a mean value. It is meant > to indicate the limits and sometimes direction of change within a specific > time period giving rise to the candle forming the central part of the > graph. In my opinion a minimal box and whisker approach is more readily > interpretable. > > > I keep saying "candlestick" when I mean to say "box and whiskers". My > mistake. You are spot on correct, the error is mine. > As much as I use stats in my job, I wonder what the value of knowing the upper quartile is of my SAC rate or any other parameter that I may be tracking. For diving planning purposes I'd need to use my max air consumption after filtering the dive list to get appropriate dives. I don't think this is providing the average user with useful data. It's got mathematical pureness to provide a 5-number data visualization assuming the filtered list provides a statistically significant number of data points. Other than that, do we care? Should we care? I will send a sample box plot to a diving friend of mine who's a part-time dive pro. I'd be surprised if he knows how to interpret it. Histograms are more readily understood but unfortunately take up a lot of space, and the issue of choosing the bin size gets challenging as you've discussed when it comes to depth. ...Hartley
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