Frequencies for first 10,000 rows of cause3 variable in nhamcsopd1996 dataset :

   cause of |
  injury #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,997       99.97       99.97
       8493 |          2        0.02       99.99
       8494 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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