Frequencies for first 10,000 rows of induct variable in natl1992 dataset :

  Induction |
   of labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        836        8.36        8.36
          2 |      9,153       91.53       99.89
          9 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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