Frequencies for first 10,000 rows of proc8 variable in namcs1994 dataset :

 service #8 |
  procedure |
   code - 4 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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