Frequencies for first 10,000 rows of a_imp2 variable in veh_aux dataset :

  principal |
     impact |
      point |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016