Frequencies for first 10,000 rows of uop_induc variable in natl2012 dataset :

  Induction |
   of labor |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,842       18.42       18.42
          2 |      5,724       57.24       75.66
          9 |      2,434       24.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016