Frequencies for mdc variable in drg2mdcxw1992 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          9        1.83        1.83
          1 |         35        7.11        8.94
          2 |         13        2.64       11.59
          3 |         31        6.30       17.89
          4 |         30        6.10       23.98
          5 |         45        9.15       33.13
          6 |         40        8.13       41.26
          7 |         18        3.66       44.92
          8 |         50       10.16       55.08
          9 |         28        5.69       60.77
         10 |         17        3.46       64.23
         11 |         32        6.50       70.73
         12 |         19        3.86       74.59
         13 |         17        3.46       78.05
         14 |         15        3.05       81.10
         15 |          7        1.42       82.52
         16 |          8        1.63       84.15
         17 |         17        3.46       87.60
         18 |          9        1.83       89.43
         19 |          9        1.83       91.26
         20 |          6        1.22       92.48
         21 |         17        3.46       95.93
         22 |          6        1.22       97.15
         23 |          7        1.42       98.58
         24 |          4        0.81       99.39
         25 |          3        0.61      100.00
------------+-----------------------------------
      Total |        492      100.00

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