Frequencies for first 10,000 rows of proc5 variable in nhamcsopd2010 dataset :

procedure 5 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,961       99.61       99.61
       4513 |          1        0.01       99.62
       5123 |          1        0.01       99.63
       5305 |          1        0.01       99.64
       5343 |          2        0.02       99.66
       5351 |          1        0.01       99.67
       5749 |          1        0.01       99.68
       598- |          1        0.01       99.69
       8541 |          1        0.01       99.70
       8619 |          2        0.02       99.72
       863- |          3        0.03       99.75
       8826 |          1        0.01       99.76
       8938 |         16        0.16       99.92
       8959 |          3        0.03       99.95
       9139 |          1        0.01       99.96
       9390 |          1        0.01       99.97
       9509 |          1        0.01       99.98
       9784 |          1        0.01       99.99
       9955 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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