Frequencies for first 10,000 rows of injprev variable in nhamcsopd1997 dataset :

     injury |
 prevention |
 couns/educ |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,686       96.86       96.86
          1 |        314        3.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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