Frequencies for first 10,000 rows of injury variable in natl2002 dataset :

      Birth |
     injury |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         69        0.69        0.69
          2 |      9,560       95.60       96.29
          8 |          2        0.02       96.31
          9 |        369        3.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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