Frequencies for first 10,000 rows of injury variable in namcs2006 dataset :

  is injury |
      visit |
   related? |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,064       90.64       90.64
        yes |        936        9.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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