DK list

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Phrases that are identified as Don't Know type responses are ones that contain one or more of:

  • dk
  • dont know
  • don't know
  • don t know
  • unsure
  • not sure
  • do not know
  • no idea
  • not applicable

The matching of these is not case sensitive.

Additionally, where a label is, in its entirety, NA or na, it is treated as a Don't Know.