Frequencies for first 10,000 rows of intent variable in namcs1997 dataset :

     intentionality of injury - from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          4        0.04        0.04
                       Yes (assault) |         16        0.16        0.20
                   No, Unintentional |        542        5.42        5.62
                             Unknown |        291        2.91        8.53
Not applicable (not an injury visit) |      9,147       91.47      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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