Frequencies for first 10,000 rows of scpwi23d variable in nhamcsopd2003 dataset :

      scope |
  procedure |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,995       99.95       99.95
        451 |          4        0.04       99.99
        563 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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