Frequencies for first 10,000 rows of intentr variable in nhamcsopd2004 dataset :

   intentionality of injury based on |
                              e-code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
not applicable (not an injury visit) |      8,852       88.52       88.52
                       unintentional |        586        5.86       94.38
                      self-inflicted |          2        0.02       94.40
                             assault |         25        0.25       94.65
                      unknown intent |          8        0.08       94.73
              adverse medical effect |         97        0.97       95.70
                         blank cause |        430        4.30      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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