Frequencies for first 10,000 rows of prov2870 variable in pos1992 dataset :

transplanta |
       tion |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,936       99.36       99.36
          A |         39        0.39       99.75
          B |         15        0.15       99.90
          C |          2        0.02       99.92
          D |          1        0.01       99.93
          E |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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