Frequencies for first 10,000 rows of prov2030 variable in pos1994 dataset :

       self |
   dialysis |
certificati |
         on |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,894       98.94       98.94
          A |         88        0.88       99.82
          B |         14        0.14       99.96
          E |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017