Frequencies for first 10,000 rows of rniflag_7 variable in linkco1991us_num dataset :

  Nature of |
Injury Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         59        0.59        0.59
          1 |         11        0.11        0.70
          . |      9,930       99.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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