Frequencies for first 10,000 rows of prov2870 variable in pos1993 dataset :

transplanta |
       tion |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,945       99.45       99.45
          A |         41        0.41       99.86
          B |          9        0.09       99.95
          C |          1        0.01       99.96
          D |          1        0.01       99.97
          E |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016