Frequencies for first 10,000 rows of procnone variable in nhamcsed1992 dataset :

 Procedures |
     - none |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,897       38.97       38.97
          1 |      6,103       61.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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