Frequencies for first 10,000 rows of cause33d variable in nhamcsed2006 dataset :

             cause of injury #3 - broad |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   not applicable/blank |      9,948       99.48       99.48
                         drug use/abuse |         10        0.10       99.58
                      alcohol use/abuse |         13        0.13       99.71
                    place of occurrence |         23        0.23       99.94
accidental poisoning by other psychot.. |          1        0.01       99.95
    accidental poisoning by other drugs |          1        0.01       99.96
accidents caused by cutting and pierc.. |          1        0.01       99.97
   overexertion and strenuous movements |          1        0.01       99.98
suicide and self-inflicted injury by .. |          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