Frequencies for mdc variable in drg1990 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        1.26        1.26
          1 |         35        7.32        8.58
          2 |         13        2.72       11.30
          3 |         31        6.49       17.78
          4 |         30        6.28       24.06
          5 |         43        9.00       33.05
          6 |         40        8.37       41.42
          7 |         18        3.77       45.19
          8 |         49       10.25       55.44
          9 |         28        5.86       61.30
         10 |         17        3.56       64.85
         11 |         32        6.69       71.55
         12 |         19        3.97       75.52
         13 |         17        3.56       79.08
         14 |         15        3.14       82.22
         15 |          7        1.46       83.68
         16 |          8        1.67       85.36
         17 |         16        3.35       88.70
         18 |          9        1.88       90.59
         19 |          9        1.88       92.47
         20 |          6        1.26       93.72
         21 |         17        3.56       97.28
         22 |          6        1.26       98.54
         23 |          7        1.46      100.00
------------+-----------------------------------
      Total |        478      100.00

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