Frequencies for first 10,000 rows of rf_inftr variable in natlterr2015 dataset :

Infertility |
  Treatment |
 Used Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,078       10.78       10.78
          N |      8,831       88.31       99.09
          U |         57        0.57       99.66
          Y |         34        0.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016