Frequencies for first 10,000 rows of scopwi2r variable in nhamcsopd2002 dataset :

      scope |
  procedure |
write-in #2 |
   - recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,987       99.87       99.87
       2911 |          1        0.01       99.88
       3142 |          1        0.01       99.89
       4513 |          1        0.01       99.90
       4523 |          5        0.05       99.95
       5421 |          1        0.01       99.96
       5631 |          2        0.02       99.98
       5732 |          1        0.01       99.99
       9999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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