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

speed limit |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         88        0.88        0.88
          5 |          3        0.03        0.91
         10 |          3        0.03        0.94
         15 |         17        0.17        1.11
         20 |         17        0.17        1.28
         25 |        544        5.44        6.72
         30 |        374        3.74       10.46
         35 |      1,128       11.28       21.74
         40 |      1,038       10.38       32.12
         45 |      1,619       16.19       48.31
         50 |        531        5.31       53.62
         55 |      2,238       22.38       76.00
         60 |        200        2.00       78.00
         65 |      1,408       14.08       92.08
         70 |        408        4.08       96.16
         75 |        165        1.65       97.81
         98 |        149        1.49       99.30
         99 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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