Frequencies for first 10,000 rows of scopewi2 variable in namcs2004 dataset :

      scope |
  procedure |
write-in #2 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,991       99.91       99.91
       3142 |          1        0.01       99.92
       4513 |          3        0.03       99.95
       4523 |          2        0.02       99.97
       4542 |          1        0.01       99.98
       5631 |          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