Frequencies for mdc variable in drg2mdcxw2006 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         14        2.60        2.60
          1 |         46        8.55       11.15
          2 |         13        2.42       13.57
          3 |         31        5.76       19.33
          4 |         30        5.58       24.91
          5 |         55       10.22       35.13
          6 |         44        8.18       43.31
          7 |         20        3.72       47.03
          8 |         59       10.97       57.99
          9 |         28        5.20       63.20
         10 |         17        3.16       66.36
         11 |         33        6.13       72.49
         12 |         19        3.53       76.02
         13 |         17        3.16       79.18
         14 |         15        2.79       81.97
         15 |          7        1.30       83.27
         16 |          9        1.67       84.94
         17 |         18        3.35       88.29
         18 |         11        2.04       90.33
         19 |          9        1.67       92.01
         20 |          4        0.74       92.75
         21 |         17        3.16       95.91
         22 |          8        1.49       97.40
         23 |          7        1.30       98.70
         24 |          4        0.74       99.44
         25 |          3        0.56      100.00
------------+-----------------------------------
      Total |        538      100.00

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