Frequencies for first 10,000 rows of cause2 variable in nhamcsed1993 dataset :

   cause of |
  injury #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
      80000 |      7,189       71.89       71.89
      80019 |      2,764       27.64       99.53
      88490 |         13        0.13       99.66
      88494 |          6        0.06       99.72
      88496 |          9        0.09       99.81
      88497 |          2        0.02       99.83
      88508 |          1        0.01       99.84
      88532 |          1        0.01       99.85
      88550 |          1        0.01       99.86
      88580 |          1        0.01       99.87
      88601 |          1        0.01       99.88
      88781 |          1        0.01       99.89
      88809 |          1        0.01       99.90
      88880 |          1        0.01       99.91
      89060 |          1        0.01       99.92
      89120 |          1        0.01       99.93
      89179 |          1        0.01       99.94
      89209 |          1        0.01       99.95
      89262 |          1        0.01       99.96
      89289 |          1        0.01       99.97
      89660 |          1        0.01       99.98
      89688 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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