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

  Fertility |
  Enhancing |
  Drugs RFP |
591=f_rf_in |
   ft_drg R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |         15        0.15        0.15
          U |        167        1.67        1.82
          X |      9,747       97.47       99.29
          Y |         71        0.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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