Frequencies for speedrel variable in vehnit dataset :

      SPEED |
    RELATED |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          4        0.36        0.36
          9 |      1,112       99.64      100.00
------------+-----------------------------------
      Total |      1,116      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016