Frequencies for first 10,000 rows of rniflag_2 variable in linkco1991us_num dataset :

  Nature of |
Injury Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,494       64.94       64.94
          1 |        200        2.00       66.94
          . |      3,306       33.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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