Frequencies for first 10,000 rows of uop_induc variable in natl2011 dataset :

  Induction |
   of labor |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,930       19.30       19.30
          2 |      6,414       64.14       83.44
          9 |      1,656       16.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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