Frequencies for first 10,000 rows of injprev variable in namcs2005 dataset :

     injury |
 prevention |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,358       93.58       93.58
          1 |        642        6.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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