Frequencies for first 10,000 rows of proc23 variable in nhamcsed1995 dataset :

      other |
  procedure |
 #2 - 3 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,997       99.97       99.97
        893 |          1        0.01       99.98
        982 |          1        0.01       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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