Frequencies for first 10,000 rows of ld_ster variable in natlterr2013 dataset :

   Steroids |
        RFP |
611=f_ld_st |
   eroids R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,413       84.13       94.90
          U |        380        3.80       98.70
          Y |        130        1.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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