This was a really interesting bi variate map not just for the topic it is covering, but the way it used lightness and darkness to convey the accuracy of the test. It looks quite different from a regular 3x3 choropleth because of the many classes it has, however, the lightness makes it easy to recognize some of the most polar colors. However, it is a bit difficult to differentiate between the middle values.
https://andrewpwheeler.wordpress.com/2012/08/24/making-value-by-alpha-maps-with-arcmap/
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