Frequencies for first 10,000 rows of f_rf_inft_drg variable in natl2013 dataset :

  Fertility |
    Enhance |
       Drug |
(rf_inft_dr |
       g) R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          4        0.04        0.04
          1 |      9,996       99.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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