Frequencies for first 10,000 rows of proc52d variable in nhamcsopd2009 dataset :

procedure 5 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,979       99.79       99.79
         45 |          2        0.02       99.81
         49 |          1        0.01       99.82
         87 |          1        0.01       99.83
         88 |          1        0.01       99.84
         89 |         10        0.10       99.94
         93 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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