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<div class="moz-cite-prefix">On 2020/05/13 23:11, Dirk Hohndel via
subsurface wrote:<br>
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cite="mid:C1E507D8-0B27-4C64-8552-F9BE9072E3DA@hohndel.org">
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The video that Pedro linked to seemed to indicate that the first
chart is most likely to be understood, and that the the second one
was harder to see trends in.
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<div class="">Conflicting with that is the desire to more
typically show bar graphs sideways, as that makes it easier to
deal with many data sets (think labeling the columns vs.
labeling rows)</div>
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<div class="">So all this is super helpful in figuring out how we
should visualize these things - but not necessarily all leading
to the same answers, as I'm not sure how well these line graphs
work when turned 90 degrees :-)</div>
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<div class="">/D</div>
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<div class="">On May 13, 2020, at 12:53 PM, Hartley Horwitz
<<a href="mailto:hhrwtz@gmail.com" class=""
moz-do-not-send="true">hhrwtz@gmail.com</a>> wrote:</div>
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<div class="">I"ve attached 3 graphs showing the
statistics summary. Once again I showed them to a
work colleague. He found the upper 2 graphs easiest
to understand. </div>
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<div class="">...Hartley</div>
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<div class="gmail_attr" dir="ltr">On Wed, May 13, 2020
at 3:24 PM Dirk Hohndel <<a
href="mailto:dirk@hohndel.org" class=""
moz-do-not-send="true">dirk@hohndel.org</a>>
wrote:<br class="">
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<div style="word-wrap:break-word" class="">That is
excellent input!
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<div class="">Your final point is one that I had
kinda assumed - most of the "more interesting"
data no one but a geek will look into. And to
them either box and whiskers (so quartiles) or
at least floating box with mean (or your version
in the first SAC chart below with the 0 based
box with the mean as height and with whiskers
for min/max) should make sense. But it also
makes sense to look for simper ways to give
access to the same data. Can you give an example
for the "line graph with 3 lines for
min/mean/max"?</div>
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<div class="">Thanks</div>
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<div class="">/D<br class="">
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id="326EAADD-7AAB-4D5E-88C1-45D3DFA41BDF"
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<p>I must admit that I do not like any of these three
representations. They are inappropriate and inaccurate, leading to
misinterpretation.<br>
</p>
<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>
<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>
<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>
<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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