Frequencies for first 10,000 rows of scopewi2 variable in nhamcsopd2006 dataset :

      scope |
  procedure |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,985       99.85       99.85
       3323 |          1        0.01       99.86
       4513 |          5        0.05       99.91
       4523 |          4        0.04       99.95
       6812 |          1        0.01       99.96
       6823 |          1        0.01       99.97
       9999 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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