Frequencies for first 10,000 rows of proc73d variable in nhamcsopd2010 dataset :

procedure 7 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,997       99.97       99.97
        471 |          1        0.01       99.98
        530 |          1        0.01       99.99
        963 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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