Frequencies for first 10,000 rows of violence variable in nhamcsed1995 dataset :

         is injury violence related? |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
Not applicable (not an injury visit) |      6,313       63.13       63.13
                                  No |      3,383       33.83       96.96
 Yes, interpersonal violence/assault |        243        2.43       99.39
        Yes, Suicide/suicide attempt |         61        0.61      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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