Frequencies for first 10,000 rows of cause2 variable in nhamcsopd1996 dataset :

   cause of |
  injury #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,933       99.33       99.33
       8159 |          1        0.01       99.34
       8490 |         14        0.14       99.48
       8493 |         13        0.13       99.61
       8494 |          1        0.01       99.62
       8496 |          4        0.04       99.66
       8497 |          4        0.04       99.70
       8498 |          7        0.07       99.77
       8786 |          1        0.01       99.78
       8792 |          1        0.01       99.79
       885- |          3        0.03       99.82
       887- |          1        0.01       99.83
       888- |          4        0.04       99.87
       899- |          1        0.01       99.88
       9064 |          1        0.01       99.89
       9068 |          1        0.01       99.90
       9179 |          2        0.02       99.92
       918- |          1        0.01       99.93
       9259 |          1        0.01       99.94
       9352 |          1        0.01       99.95
       9494 |          2        0.02       99.97
       9600 |          1        0.01       99.98
       9601 |          1        0.01       99.99
       9688 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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