Frequencies for mdc variable in drg1991 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          9        1.84        1.84
          1 |         35        7.14        8.98
          2 |         13        2.65       11.63
          3 |         31        6.33       17.96
          4 |         30        6.12       24.08
          5 |         45        9.18       33.27
          6 |         40        8.16       41.43
          7 |         18        3.67       45.10
          8 |         49       10.00       55.10
          9 |         28        5.71       60.82
         10 |         17        3.47       64.29
         11 |         32        6.53       70.82
         12 |         19        3.88       74.69
         13 |         17        3.47       78.16
         14 |         15        3.06       81.22
         15 |          7        1.43       82.65
         16 |          8        1.63       84.29
         17 |         16        3.27       87.55
         18 |          9        1.84       89.39
         19 |          9        1.84       91.22
         20 |          6        1.22       92.45
         21 |         17        3.47       95.92
         22 |          6        1.22       97.14
         23 |          7        1.43       98.57
         24 |          4        0.82       99.39
         25 |          3        0.61      100.00
------------+-----------------------------------
      Total |        490      100.00

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