Frequencies for first 10,000 rows of uop_induc variable in linkpe2009psden dataset :

  Induction |
   of labor |
        U;R |
(f_uop_indu |
     ct rep |
      flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        637        6.37        6.37
          2 |      9,299       92.99       99.36
          9 |         64        0.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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