Frequencies for first 10,000 rows of ld_ster variable in natl2013 dataset :

   Steroids |
        RFP |
611=f_ld_st |
   eroids R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,673       96.73       96.73
          U |        153        1.53       98.26
          Y |        174        1.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015