Frequencies for first 10,000 rows of f_rf_inf_art variable in natl2012 dataset :

Reproductiv |
          e |
 Technology |
(rf_inf_art |
        ) R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,991       99.91       99.91
          1 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016