Frequencies for first 10,000 rows of uop_induc variable in natlterr2010 dataset :

  Induction |
   of labor |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        571        5.71        5.71
          2 |      7,313       73.13       78.84
          9 |      2,116       21.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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