Frequencies for first 10,000 rows of scopewi2 variable in nhamcsopd2001 dataset :

      scope |
  procedure |
write-in #2 |
  - 4 digit |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,996       99.96       99.96
       0022 |          2        0.02       99.98
       4542 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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