Frequencies for first 10,000 rows of intent variable in namcs2000 dataset :

       intentionality of injury from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          4        0.04        0.04
                       Yes (assault) |         10        0.10        0.14
                   No, Unintentional |        642        6.42        6.56
                             Unknown |        343        3.43        9.99
Not applicable (not an injury visit) |      9,001       90.01      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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