Frequencies for first 10,000 rows of proc42d variable in nhamcsopd2010 dataset :

procedure 4 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,845       98.45       98.45
         48 |          1        0.01       98.46
         51 |          1        0.01       98.47
         54 |          1        0.01       98.48
         86 |          4        0.04       98.52
         89 |        111        1.11       99.63
         93 |          5        0.05       99.68
         95 |         30        0.30       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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