Frequencies for first 10,000 rows of cause2 variable in nhamcsopd2000 dataset :

   cause of |
  injury #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
       0000 |      9,983       99.83       99.83
       8781 |          1        0.01       99.84
       8783 |          1        0.01       99.85
       8809 |          1        0.01       99.86
       885- |          1        0.01       99.87
       8860 |          1        0.01       99.88
       897- |          1        0.01       99.89
       899- |          1        0.01       99.90
       9170 |          2        0.02       99.92
       9179 |          2        0.02       99.94
       9208 |          2        0.02       99.96
       9248 |          1        0.01       99.97
       927- |          2        0.02       99.99
       9294 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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