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The principal drawback of a bivariate choropleth is that

  • A.it requires the two variables to be identical
  • B.it works only for units of equal area
  • C.its legend is demanding to interpret
  • D.it cannot be printed in more than one colour

Answer: C

Correct answer: its legend is demanding to interpret

A bivariate choropleth crosses two classifications, so a three-by-three scheme needs nine colours arranged in a square that the reader must learn before any part of the map can be read. That cost is real and is why the technique is used sparingly, but the map does not require equal areas, identical variables or a single colour - those three are inventions.

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