Frequencies for first 10,000 rows of rniflag_4 variable in linkco1991us_num dataset :

  Nature of |
Injury Flag |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,687       16.87       16.87
          1 |         77        0.77       17.64
          . |      8,236       82.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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