Frequencies for first 10,000 rows of ld_ster variable in natl2015 dataset :

 Steroids Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,716       97.16       97.16
          U |         63        0.63       97.79
          Y |        221        2.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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