Frequencies for mdc variable in drg1987 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          3        0.63        0.63
          1 |         35        7.34        7.97
          2 |         13        2.73       10.69
          3 |         26        5.45       16.14
          4 |         30        6.29       22.43
          5 |         43        9.01       31.45
          6 |         45        9.43       40.88
          7 |         18        3.77       44.65
          8 |         49       10.27       54.93
          9 |         28        5.87       60.80
         10 |         17        3.56       64.36
         11 |         32        6.71       71.07
         12 |         19        3.98       75.05
         13 |         17        3.56       78.62
         14 |         15        3.14       81.76
         15 |          7        1.47       83.23
         16 |          8        1.68       84.91
         17 |         16        3.35       88.26
         18 |          9        1.89       90.15
         19 |          9        1.89       92.03
         20 |          6        1.26       93.29
         21 |         17        3.56       96.86
         22 |          6        1.26       98.11
         23 |          7        1.47       99.58
          . |          2        0.42      100.00
------------+-----------------------------------
      Total |        477      100.00

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