Frequencies for first 10,000 rows of injury variable in nhamcsopd2001 dataset :

   is visit |
 related to |
    injury, |
 poisoning, |
     or ... |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,944       89.44       89.44
        Yes |      1,056       10.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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