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

speed limit |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         90        0.90        0.90
         10 |          3        0.03        0.93
         15 |         20        0.20        1.13
         20 |         16        0.16        1.29
         25 |        467        4.67        5.96
         30 |        315        3.15        9.11
         35 |      1,043       10.43       19.54
         40 |        953        9.53       29.07
         45 |      1,448       14.48       43.55
         50 |        549        5.49       49.04
         55 |      2,425       24.25       73.29
         60 |        184        1.84       75.13
         65 |      1,557       15.57       90.70
         70 |        422        4.22       94.92
         75 |        194        1.94       96.86
         98 |        122        1.22       98.08
         99 |        192        1.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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