Frequencies for first 10,000 rows of intent variable in nhamcsopd1997 dataset :

       intentionality of injury from |
                            checkbox |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                Yes (self-inflicted) |          3        0.03        0.03
                       Yes (assault) |         33        0.33        0.36
                   No, Unintentional |        685        6.85        7.21
                             Unknown |        236        2.36        9.57
Not applicable (not an injury visit) |      9,043       90.43      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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