Frequencies for first 10,000 rows of scpwi23d variable in nhamcsopd2006 dataset :

      scope |
  procedure |
     #2 - 3 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,985       99.85       99.85
        332 |          1        0.01       99.86
        451 |          5        0.05       99.91
        452 |          4        0.04       99.95
        681 |          1        0.01       99.96
        682 |          1        0.01       99.97
        999 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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