Frequencies for first 10,000 rows of prov2030 variable in pos1995 dataset :

       self |
   dialysis |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,879       98.79       98.79
          A |         96        0.96       99.75
          B |         17        0.17       99.92
          E |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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