Frequencies for first 10,000 rows of intent variable in nhamcsopd2000 dataset :

       intentionality of injury from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          6        0.06        0.06
                       Yes (assault) |         34        0.34        0.40
                   No, Unintentional |        616        6.16        6.56
                             Unknown |        339        3.39        9.95
Not applicable (not an injury visit) |      9,005       90.05      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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