Frequencies for first 10,000 rows of violence variable in nhamcsed1996 dataset :

         is injury violence related? |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
Not applicable (not an injury visit) |      6,250       62.50       62.50
                                  No |      3,399       33.99       96.49
 Yes, interpersonal violence/assault |        294        2.94       99.43
        Yes, Suicide/suicide attempt |         57        0.57      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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