Frequencies for first 10,000 rows of prov2025 variable in pos1992 dataset :

       self |
   dialysis |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,952       99.52       99.52
          A |         47        0.47       99.99
          B |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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