Frequencies for first 10,000 rows of proc43d variable in nhamcsopd2009 dataset :

procedure 4 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,939       99.39       99.39
        332 |          1        0.01       99.40
        451 |          1        0.01       99.41
        454 |          2        0.02       99.43
        482 |          1        0.01       99.44
        492 |          1        0.01       99.45
        598 |          1        0.01       99.46
        663 |          1        0.01       99.47
        862 |          1        0.01       99.48
        891 |         11        0.11       99.59
        893 |         14        0.14       99.73
        919 |          1        0.01       99.74
        930 |          2        0.02       99.76
        931 |          1        0.01       99.77
        932 |          2        0.02       99.79
        933 |          1        0.01       99.80
        934 |          1        0.01       99.81
        938 |          5        0.05       99.86
        939 |          8        0.08       99.94
        952 |          3        0.03       99.97
        954 |          1        0.01       99.98
        967 |          1        0.01       99.99
        993 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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