Frequencies for first 10,000 rows of injprev variable in namcs2014 dataset :

     Injury |
 prevention |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,704       97.04       97.04
        Yes |        296        2.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017