Frequencies for first 10,000 rows of uab_injury variable in natl2005 dataset :

      Birth |
   Injury U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         19        0.19        0.19
          2 |      9,852       98.52       98.71
          9 |        129        1.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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