Frequencies for first 10,000 rows of proc53d variable in nhamcsopd2010 dataset :

procedure 5 |
  - 2 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,961       99.61       99.61
        451 |          1        0.01       99.62
        512 |          1        0.01       99.63
        530 |          1        0.01       99.64
        534 |          2        0.02       99.66
        535 |          1        0.01       99.67
        574 |          1        0.01       99.68
        598 |          1        0.01       99.69
        854 |          1        0.01       99.70
        861 |          2        0.02       99.72
        863 |          3        0.03       99.75
        882 |          1        0.01       99.76
        893 |         16        0.16       99.92
        895 |          3        0.03       99.95
        913 |          1        0.01       99.96
        939 |          1        0.01       99.97
        950 |          1        0.01       99.98
        978 |          1        0.01       99.99
        995 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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