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

speed limit |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         68        0.68        0.68
          5 |          1        0.01        0.69
         10 |          4        0.04        0.73
         15 |         15        0.15        0.88
         20 |         15        0.15        1.03
         25 |        539        5.39        6.42
         30 |        362        3.62       10.04
         35 |      1,115       11.15       21.19
         40 |        959        9.59       30.78
         45 |      1,655       16.55       47.33
         50 |        509        5.09       52.42
         55 |      2,372       23.72       76.14
         60 |        207        2.07       78.21
         65 |      1,346       13.46       91.67
         70 |        454        4.54       96.21
         75 |        178        1.78       97.99
         98 |        116        1.16       99.15
         99 |         85        0.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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