Frequencies for first 10,000 rows of ld_ster variable in natlterr2014 dataset :

 Steroids Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,615       86.15       96.92
          U |        157        1.57       98.49
          Y |        151        1.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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