Frequencies for first 10,000 rows of proc62d variable in nhamcsopd2010 dataset :

procedure 6 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,988       99.88       99.88
         45 |          1        0.01       99.89
         47 |          1        0.01       99.90
         48 |          1        0.01       99.91
         85 |          1        0.01       99.92
         86 |          2        0.02       99.94
         88 |          1        0.01       99.95
         89 |          3        0.03       99.98
         95 |          1        0.01       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016