Frequencies for first 10,000 rows of proc22 variable in nhamcsed1996 dataset :

      other |
  procedure |
 #2 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,988       99.88       99.88
         39 |          1        0.01       99.89
         42 |          1        0.01       99.90
         68 |          1        0.01       99.91
         86 |          2        0.02       99.93
         87 |          1        0.01       99.94
         89 |          1        0.01       99.95
         91 |          1        0.01       99.96
         93 |          1        0.01       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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