Frequencies for first 10,000 rows of cause33d variable in nhamcsed2003 dataset :

             cause of injury #3 - broad |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   not applicable/blank |      9,939       99.39       99.39
                         drug use/abuse |          7        0.07       99.46
                      alcohol use/abuse |         10        0.10       99.56
                   pedal cycle accident |          1        0.01       99.57
                    place of occurrence |         33        0.33       99.90
surg operatn/oth surg procs as caus o.. |          1        0.01       99.91
fall on same level from slipping, tri.. |          1        0.01       99.92
             other and unspecified fall |          2        0.02       99.94
  hunger, thirst, exposure, and neglect |          1        0.01       99.95
other and unspecified environmental a.. |          1        0.01       99.96
      late effects of accidental injury |          1        0.01       99.97
                  other anti-infectives |          1        0.01       99.98
suicide and self-inflicted poisoning .. |          1        0.01       99.99
 child battering and other maltreatment |          1        0.01      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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