Frequencies for first 10,000 rows of prov1760 variable in pos1994 dataset :

      renal |
   dialysis |
center code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,897       98.97       98.97
          A |         99        0.99       99.96
          B |          3        0.03       99.99
          C |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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