Frequencies for first 10,000 rows of cause33d variable in nhamcsed2007 dataset :

   cause of |
injury #3 - |
      broad |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |      9,951       99.51       99.51
        700 |          4        0.04       99.55
        710 |         27        0.27       99.82
        819 |          1        0.01       99.83
        849 |         13        0.13       99.96
        850 |          1        0.01       99.97
        935 |          1        0.01       99.98
        946 |          1        0.01       99.99
        956 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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