Frequencies for first 10,000 rows of prov2870 variable in pos1991 dataset :

transplanta |
       tion |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,942       99.42       99.42
          A |         37        0.37       99.79
          B |         14        0.14       99.93
          C |          1        0.01       99.94
          D |          1        0.01       99.95
          E |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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