Frequencies for first 10,000 rows of cause33d variable in nhamcsed1992 dataset :

   Cause of |
injury #3 - |
      broad |      Freq.     Percent        Cum.
------------+-----------------------------------
       8000 |      9,995       99.95       99.95
       8849 |          2        0.02       99.97
       8879 |          1        0.01       99.98
       8968 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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