Frequencies for first 10,000 rows of rf_fedrg variable in natl2014 dataset :

  Fertility |
  Enhancing |
Drugs Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |         39        0.39        0.39
          U |        128        1.28        1.67
          X |      9,777       97.77       99.44
          Y |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016