Frequencies for first 10,000 rows of ld_ster variable in natl2014 dataset :

 Steroids Y |
        Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,759       97.59       97.59
          U |         73        0.73       98.32
          Y |        168        1.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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