<div dir="auto"><div>I think it's great statistics are being tackled again, and it's excellent to have several mock-ups to discuss so hopefully some consensus can be made before people spend countless hours on code that ends up rejected because the presentation isn't as desired.<br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 14 May 2020, 17:24 Willem Ferguson via subsurface, <<a href="mailto:subsurface@subsurface-divelog.org">subsurface@subsurface-divelog.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>I must admit that I do not like any of these three
representations. They are inappropriate and inaccurate, leading to
misinterpretation.<br></div>
<p>The top graph is normally used to indicate trends in three
*independent* variables that may or may not be correlated. In the
dive the data represent a *single* variable with its min and max
values.</p></div></blockquote></div></div><div dir="auto">I would agree if the graph were plotting data from each dive. But as it's shown it is a plot of yearly min, max and median I don't think it's a misinterpretation.</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
<p>The middle graph is a histogram that would normally also
represent three *independent* variables that have been sampled on
the same x-axis scale. Again, in the dive case the min and max
values represent the *same* variable.</p>
<p>The bottom graph is normally used to indicate the proportion of a
total that is formed by a specific component. In the case of this
specific graph, the median would be indicated by the height of the
orange bar (i.e. vertical distance between the grey-orange border
and the orange/blue border). The max would be indicated by the
height of the blue part of the graph, etc. Clearly this is not
what is meant.</p></div></blockquote></div></div><div dir="auto">I agree completely.</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
<p>I want to make a call that, if we are dealing with representing
statistics, we actually use the proper statistics representations
that we are all used to. Most likely that is either some variant
of a box and whiskers diagram or a vertical bar chart with error
bars. If these diagrams have been shown once to an uninformed
person, the interpretation will always be easy. Lets use diagrams
for what they are meant to convey and not use a sports car to
drive offroad. We do not want any statistics related to Subsurface
to be presented in an unprofessional and inappropriate way.<br></p></div></blockquote></div></div><div dir="auto">Yes, graphs should be used appropriately</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><p>
</p>
<p>As far as the horizontal graphs are concerned, they have a place,
but we need to understand where they come from, and that is from
the old days when we tried to print graphs on a mainframe line
printer that could not print characters vertically. The
conventional way to represent histograms or bar charts is in the
vertical way *unless there is good reason to do otherwise*. These
days there is no problem in printing labels vertically. To have a
horizontal bar graph with depth measurements along the vertical
axis is just totally unorthodox and not up to modern standards.</p>
<p>Kind regards,</p>
<p>willem</p>
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