Frequencies for first 10,000 rows of procnone variable in nhamcsed1994 dataset :

 procedures |
     - none |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,218       42.18       42.18
          1 |      5,782       57.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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