Frequencies for first 10,000 rows of cause33d variable in nhamcsed1996 dataset :

   cause of |
injury #3 - |
      broad |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,981       99.81       99.81
        849 |         15        0.15       99.96
        855 |          1        0.01       99.97
        860 |          1        0.01       99.98
        879 |          1        0.01       99.99
        947 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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