Frequencies for swim_ool variable in fmli132 dataset :

   swim_ool |      Freq.     Percent        Cum.
------------+-----------------------------------
          A |      5,987       88.54       88.54
          C |          9        0.13       88.67
          D |        766       11.33      100.00
------------+-----------------------------------
      Total |      6,762      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016