Frequencies for first 10,000 rows of scpwi23d variable in nhamcsopd2002 dataset :

      scope |
  procedure |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,987       99.87       99.87
        291 |          1        0.01       99.88
        314 |          1        0.01       99.89
        451 |          1        0.01       99.90
        452 |          5        0.05       99.95
        542 |          1        0.01       99.96
        563 |          2        0.02       99.98
        573 |          1        0.01       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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