Frequencies for first 10,000 rows of proc variable in nhamcsed2003 dataset :

   were any |
 procedures |
provided at |
this visit? |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      5,041       50.41       50.41
        yes |      4,448       44.48       94.89
  no answer |        511        5.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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