Frequencies for first 10,000 rows of injury variable in natl1992 dataset :

     Injury |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |      9,958       99.58       99.63
          8 |          1        0.01       99.64
          9 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015