Frequencies for first 10,000 rows of injury variable in namcs1998 dataset :

   is visit |
 related to |
  injury or |
 poisoning? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,021       90.21       90.21
          1 |        979        9.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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