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Mapping change between two dates is more informative as a percentage than as an absolute difference when

  • A.the whole study area lies within a single country
  • B.the units differ greatly in their starting size
  • C.the two dates are reasonably close together in time
  • D.the data were collected by one and the same agency

Answer: B

A gain of a thousand means something quite different in a village and in a city, and dividing by the starting value puts the two on comparable footing. Where the units start from similar sizes, the absolute difference is easier to read.

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