Frequencies for first 10,000 rows of proc8per variable in namcs1994 dataset :

 service #8 |
  performed |
 or ordered |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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