Frequencies for first 10,000 rows of proc2r variable in nhamcsed2000 dataset :

      other |
  procedure |
       #2 - |
    numeric |
     recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,990       99.90       99.90
        481 |          1        0.01       99.91
       3893 |          1        0.01       99.92
       4542 |          1        0.01       99.93
       8903 |          2        0.02       99.95
       8954 |          1        0.01       99.96
       9425 |          1        0.01       99.97
       9462 |          1        0.01       99.98
       9903 |          1        0.01       99.99
       9999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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