Frequencies for first 10,000 rows of intent variable in namcs1999 dataset :

       intentionality of injury from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          2        0.02        0.02
                       Yes (assault) |         31        0.31        0.33
                   No, Unintentional |        829        8.29        8.62
                             Unknown |        233        2.33       10.95
Not applicable (not an injury visit) |      8,905       89.05      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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