Frequencies for mdc variable in drg2mdcxw1987 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.63        0.63
          1 |         35        7.37        8.00
          2 |         13        2.74       10.74
          3 |         26        5.47       16.21
          4 |         30        6.32       22.53
          5 |         43        9.05       31.58
          6 |         45        9.47       41.05
          7 |         18        3.79       44.84
          8 |         49       10.32       55.16
          9 |         28        5.89       61.05
         10 |         17        3.58       64.63
         11 |         32        6.74       71.37
         12 |         19        4.00       75.37
         13 |         17        3.58       78.95
         14 |         15        3.16       82.11
         15 |          7        1.47       83.58
         16 |          8        1.68       85.26
         17 |         16        3.37       88.63
         18 |          9        1.89       90.53
         19 |          9        1.89       92.42
         20 |          6        1.26       93.68
         21 |         17        3.58       97.26
         22 |          6        1.26       98.53
         23 |          7        1.47      100.00
------------+-----------------------------------
      Total |        475      100.00

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