Frequencies for first 10,000 rows of injury variable in nhamcsopd2006 dataset :

  is injury |
      visit |
   related? |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,916       89.16       89.16
        Yes |      1,084       10.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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