Frequencies for first 10,000 rows of cause3 variable in nhamcsed1996 dataset :

   cause of |
  injury #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,981       99.81       99.81
       8490 |          6        0.06       99.87
       8493 |          3        0.03       99.90
       8494 |          2        0.02       99.92
       8496 |          2        0.02       99.94
       8498 |          2        0.02       99.96
       8551 |          1        0.01       99.97
       8600 |          1        0.01       99.98
       8796 |          1        0.01       99.99
       9479 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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