Frequencies for first 10,000 rows of injury variable in nhamcsed2006 dataset :

   is visit |
 related to |
  injury or |
 poisoning? |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      6,447       64.47       64.47
        yes |      3,553       35.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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