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Let’s take a look at a plot from a survey conducted by DigitalWarRoom, its “2015 Ediscovery IQ Meter.” On page 12 of the report, which was published in July 2105, there is a plot that looks quite similar to the plot below. (The reproduction does not have tiny tick marks on the horizontal axis placed at the ends of the axis and between the vertical bars nor does it match the green color gradient of the bars.) Nevertheless, we can draw from it a few lessons in graphical presentation.

Rplot01 Digital green
First, if you label for bars with values, such as the four percentages on top of the four bars, you don’t gain anything from horizontal grid lines. In truth, you clutter the plot. Even odder, the vertical y-axis has no values so the reader can’t even calibrate lines to values!

Second, although the plot above does not show how the original has each bar with the same gradient of darker green at the bottom gradually changing hue to a lighter gree

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Returning once again to the same plot from the Winston & Strawn survey report, but shifting from criticism, we should praise several aspects of the original plot.

Screenshot (6)_snip Winston pg19
The somewhat-narrow width of the bars makes a more appealing impression than when bars are thick and therefore tightly packed shoulder to shoulder. Compare the version below where thick bars put more ink on the plot, but offer no more insights or clarity.

Similarly, the spacing between the bars helps a reader take in the message of the plot, and better than very narrow lines. The version above takes away that spacing although it adds around each box a frame colored black to clarify individual bars. This is not an improvement!