Frequencies for first 10,000 rows of cause3 variable in nhamcsopd2003 dataset :

                     cause of injury #3 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   not applicable/blank |      9,994       99.94       99.94
   overexertion and strenuous movements |          1        0.01       99.95
              place of occurrence--home |          3        0.03       99.98
place of occurrence--street and highway |          1        0.01       99.99
   place of occurrence--public building |          1        0.01      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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