Frequencies for first 10,000 rows of injury variable in nhamcsed1996 dataset :

   is visit |
 related to |
  injury or |
 poisoning? |      Freq.     Percent        Cum.
------------+-----------------------------------
        Yes |      3,750       37.50       37.50
         No |      6,250       62.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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