Frequencies for first 10,000 rows of intent variable in nhamcsopd1999 dataset :

       intentionality of injury from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          4        0.04        0.04
                       Yes (assault) |         31        0.31        0.35
                   No, Unintentional |        726        7.26        7.61
                             Unknown |        241        2.41       10.02
Not applicable (not an injury visit) |      8,998       89.98      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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