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Selecting the appropriate date

Assume that you want to build a basetable using the following timeline. One of the variables that you would like to add to the basetable is recency, the time since the last donation.

Consider a donor that has donated on the following dates.

  • January 1st 2017
  • March 23th 2017
  • April 29th 2017
  • May 15th 2017

Which date should be used to calculate the recency?

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