Frequencies for first 10,000 rows of proc22 variable in nhamcsed1997 dataset :

      other |
  procedure |
 #2 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,989       99.89       99.89
         34 |          1        0.01       99.90
         38 |          1        0.01       99.91
         45 |          1        0.01       99.92
         54 |          1        0.01       99.93
         86 |          1        0.01       99.94
         89 |          3        0.03       99.97
         94 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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