Frequencies for first 10,000 rows of intent variable in nhamcsed2008 dataset :

          intentionality of injury |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                           unknown |        690        6.90        6.90
not applicable/not an injury visit |      6,491       64.91       71.81
               yes, self-inflicted |        110        1.10       72.91
                      yes, assault |        137        1.37       74.28
                 no, unintentional |      2,572       25.72      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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