Frequencies for first 10,000 rows of prov1770 variable in pos1995 dataset :

      renal |
 transplant |
center code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,922       99.22       99.22
          A |         72        0.72       99.94
          B |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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