Frequencies for first 10,000 rows of intent variable in nhamcsed2007 dataset :

          intentionality of injury |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                           unknown |        648        6.48        6.48
not applicable/not an injury visit |      6,502       65.02       71.50
               yes, self-inflicted |        183        1.83       73.33
                      yes, assault |        167        1.67       75.00
                 no, unintentional |      2,500       25.00      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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