Frequencies for first 10,000 rows of cause23d variable in nhamcsopd2004 dataset :

             cause of injury #2 - broad |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   not applicable/blank |      9,800       98.00       98.00
                         drug use/abuse |         25        0.25       98.25
                      alcohol use/abuse |         13        0.13       98.38
                    place of occurrence |        143        1.43       99.81
   other fall from one level to another |          1        0.01       99.82
fall on same level from slipping, tri.. |          1        0.01       99.83
             other and unspecified fall |          4        0.04       99.87
striking against or struck accidental.. |          3        0.03       99.90
accidents caused by cutting and pierc.. |          2        0.02       99.92
     accident caused by firearm missile |          1        0.01       99.93
accident caus by hot substnce/objct, .. |          2        0.02       99.95
   overexertion and strenuous movements |          1        0.01       99.96
other and unspecified environmental a.. |          1        0.01       99.97
                            antibiotics |          1        0.01       99.98
 child battering and other maltreatment |          2        0.02      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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