Frequencies for first 10,000 rows of speedrel variable in vehicle dataset :

      Speed |
    Related |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |         14        0.14        0.14
          0 |      7,486       74.86       75.00
          1 |      2,050       20.50       95.50
          9 |        403        4.03       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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