Discussion
A value-by-alpha map modifies a choropleth by varying
Answer: C
Correct answer: transparency according to a second variable
A value-by-alpha map shades the units by the rate of interest in the ordinary way and then varies the opacity by a second variable, usually population, so that thinly populated units fade towards the background. It addresses the choropleth’s central distortion - that a large empty district shouts as loudly as a small crowded one - without the shape distortion a cartogram brings.
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