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  • $\begingroup$ Related: how-can-i-add-a-column-into-a-existing-dataset. $\endgroup$ Commented Nov 3, 2014 at 21:11
  • $\begingroup$ @SjoerdC.deVries, that is helpful, but appears to only apply when the new column is some function of the existing ones. $\endgroup$ Commented Nov 3, 2014 at 21:14