Frequencies for first 10,000 rows of injury variable in namcs2001 dataset :

   is visit |
 related to |
    injury, |
poisoning.. |
          . |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,840       88.40       88.40
        Yes |      1,160       11.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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