Frequencies for mdc variable in drg2007 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         13        2.25        2.25
          1 |         75       12.95       15.20
          2 |         10        1.73       16.93
          3 |         25        4.32       21.24
          4 |         40        6.91       28.15
          5 |         87       15.03       43.18
          6 |         61       10.54       53.71
          7 |         36        6.22       59.93
          8 |         99       17.10       77.03
          9 |          7        1.21       78.24
          . |        126       21.76      100.00
------------+-----------------------------------
      Total |        579      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016