Frequencies for first 10,000 rows of uop_induc variable in natlterr2013 dataset :

  Induction |
   of labor |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        575        5.75        5.75
          2 |      7,968       79.68       85.43
          9 |      1,457       14.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015