Frequencies for first 10,000 rows of injury variable in natl2001 dataset :

      Birth |
     injury |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          8        0.08        0.08
          2 |      9,987       99.87       99.95
          8 |          3        0.03       99.98
          9 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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