Frequencies for first 10,000 rows of injury variable in nhamcsed2007 dataset :

   is visit |
 related to |
  injury or |
 poisoning? |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      6,502       65.02       65.02
        yes |      3,498       34.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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