Frequencies for first 10,000 rows of proc22 variable in nhamcsed1998 dataset :

      other |
  procedure |
 #2 - 2 dgt |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,970       99.70       99.70
         28 |          1        0.01       99.71
         34 |          1        0.01       99.72
         37 |          1        0.01       99.73
         38 |          2        0.02       99.75
         45 |          1        0.01       99.76
         89 |          6        0.06       99.82
         90 |          2        0.02       99.84
         91 |          3        0.03       99.87
         93 |          1        0.01       99.88
         94 |          9        0.09       99.97
         95 |          1        0.01       99.98
         96 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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