Frequencies for first 10,000 rows of scpwi23d variable in namcs2004 dataset :

      scope |
  procedure |
write-in #2 |
  - 3 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,991       99.91       99.91
        314 |          1        0.01       99.92
        451 |          3        0.03       99.95
        452 |          2        0.02       99.97
        454 |          1        0.01       99.98
        563 |          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