Frequencies for first 10,000 rows of cause2 variable in nhamcsopd1997 dataset :

   cause of |
  injury #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,902       99.02       99.02
       848- |          2        0.02       99.04
       8490 |         27        0.27       99.31
       8493 |         25        0.25       99.56
       8494 |          5        0.05       99.61
       8495 |          7        0.07       99.68
       8496 |         14        0.14       99.82
       8497 |          3        0.03       99.85
       8498 |          1        0.01       99.86
       8788 |          1        0.01       99.87
       8839 |          1        0.01       99.88
       888- |          5        0.05       99.93
       9179 |          2        0.02       99.95
       9192 |          1        0.01       99.96
       9241 |          1        0.01       99.97
       9288 |          1        0.01       99.98
       9600 |          1        0.01       99.99
       9854 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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