Frequencies for mdc variable in drg1989 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          5        1.05        1.05
          1 |         35        7.34        8.39
          2 |         13        2.73       11.11
          3 |         31        6.50       17.61
          4 |         30        6.29       23.90
          5 |         43        9.01       32.91
          6 |         40        8.39       41.30
          7 |         18        3.77       45.07
          8 |         49       10.27       55.35
          9 |         28        5.87       61.22
         10 |         17        3.56       64.78
         11 |         32        6.71       71.49
         12 |         19        3.98       75.47
         13 |         17        3.56       79.04
         14 |         15        3.14       82.18
         15 |          7        1.47       83.65
         16 |          8        1.68       85.32
         17 |         16        3.35       88.68
         18 |          9        1.89       90.57
         19 |          9        1.89       92.45
         20 |          6        1.26       93.71
         21 |         17        3.56       97.27
         22 |          6        1.26       98.53
         23 |          7        1.47      100.00
------------+-----------------------------------
      Total |        477      100.00

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