Frequencies for first 10,000 rows of uab_injury variable in natl2003 dataset :

      Birth |
   Injury U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         56        0.56        0.56
          2 |      9,033       90.33       90.89
          8 |          7        0.07       90.96
          9 |        904        9.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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