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Separate data values from annotations

Best Practice: 

A separate column should be used for data qualifiers, descriptions, and flags, otherwise there is the potential for problems to develop during analyses. Potential entries in the descriptor column:

  • Potential sources of error
  • Missing value justification (e.g. sensor off line, human error, data rejected outside of range, data not recorded
  • Flags for values outside of expected range, questionable etc.
Description Rationale: 

Mixing numeric and textual data in one column will cause problems with analysis. Sometimes it is necessary to have both, the value and a qualifier.