Frequencies for first 10,000 rows of cause33d variable in nhamcsed1997 dataset :

   cause of |
injury #3 - |
      broad |      Freq.     Percent        Cum.
------------+-----------------------------------
        000 |      9,982       99.82       99.82
        849 |         15        0.15       99.97
        888 |          1        0.01       99.98
        950 |          1        0.01       99.99
        967 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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