Frequencies for first 10,000 rows of scpwi22d variable in nhamcsopd2006 dataset :

      scope |
  procedure |
     #2 - 2 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,985       99.85       99.85
         33 |          1        0.01       99.86
         45 |          9        0.09       99.95
         68 |          2        0.02       99.97
         99 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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