Frequencies for mdc variable in drg1997 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         10        2.02        2.02
          1 |         35        7.07        9.09
          2 |         13        2.63       11.72
          3 |         31        6.26       17.98
          4 |         29        5.86       23.84
          5 |         44        8.89       32.73
          6 |         40        8.08       40.81
          7 |         20        4.04       44.85
          8 |         46        9.29       54.14
          9 |         28        5.66       59.80
         10 |         17        3.43       63.23
         11 |         32        6.46       69.70
         12 |         19        3.84       73.54
         13 |         17        3.43       76.97
         14 |         15        3.03       80.00
         15 |          7        1.41       81.41
         16 |          8        1.62       83.03
         17 |         17        3.43       86.46
         18 |          9        1.82       88.28
         19 |          9        1.82       90.10
         20 |          5        1.01       91.11
         21 |         17        3.43       94.55
         22 |          6        1.21       95.76
         23 |          7        1.41       97.17
         24 |          4        0.81       97.98
         25 |          3        0.61       98.59
          . |          7        1.41      100.00
------------+-----------------------------------
      Total |        495      100.00

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