Frequencies for first 10,000 rows of prov1770 variable in pos1992 dataset :

      renal |
 transplant |
center code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,937       99.37       99.37
          A |         62        0.62       99.99
          B |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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