Frequencies for first 10,000 rows of proc42d variable in nhamcsopd2009 dataset :

procedure 4 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,939       99.39       99.39
         33 |          1        0.01       99.40
         45 |          3        0.03       99.43
         48 |          1        0.01       99.44
         49 |          1        0.01       99.45
         59 |          1        0.01       99.46
         66 |          1        0.01       99.47
         86 |          1        0.01       99.48
         89 |         25        0.25       99.73
         91 |          1        0.01       99.74
         93 |         20        0.20       99.94
         95 |          4        0.04       99.98
         96 |          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