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

Reproductiv |
          e |
 Technology |
(rf_inf_art |
        ) 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