Frequencies for first 10,000 rows of scopewi2 variable in namcs2006 dataset :

      scope |
  procedure |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,981       99.81       99.81
       4513 |          7        0.07       99.88
       4523 |          2        0.02       99.90
       9999 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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