Frequencies for mdc variable in drg2mdcxw1998 dataset :

      Major |
 Diagnostic |
   Category |
      (MDC) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         10        2.00        2.00
          1 |         35        7.01        9.02
          2 |         13        2.61       11.62
          3 |         31        6.21       17.84
          4 |         29        5.81       23.65
          5 |         45        9.02       32.67
          6 |         40        8.02       40.68
          7 |         20        4.01       44.69
          8 |         54       10.82       55.51
          9 |         28        5.61       61.12
         10 |         17        3.41       64.53
         11 |         32        6.41       70.94
         12 |         19        3.81       74.75
         13 |         17        3.41       78.16
         14 |         15        3.01       81.16
         15 |          7        1.40       82.57
         16 |          8        1.60       84.17
         17 |         17        3.41       87.58
         18 |          9        1.80       89.38
         19 |          9        1.80       91.18
         20 |          5        1.00       92.18
         21 |         17        3.41       95.59
         22 |          8        1.60       97.19
         23 |          7        1.40       98.60
         24 |          4        0.80       99.40
         25 |          3        0.60      100.00
------------+-----------------------------------
      Total |        499      100.00

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