Frequencies for apiflag variable in linkco1995us_unl dataset :

 Race codes |
      18-68 |
   reported |
 (beginning |
  with 1992 |
      data) |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |        708      100.00      100.00
------------+-----------------------------------
      Total |        708      100.00

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