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

     Travel |
      Speed |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        274        2.74        2.74
          1 |          3        0.03        2.77
          2 |          9        0.09        2.86
          3 |         13        0.13        2.99
          4 |          6        0.06        3.05
          5 |         83        0.83        3.88
          6 |          2        0.02        3.90
          7 |          9        0.09        3.99
          8 |         18        0.18        4.17
          9 |          1        0.01        4.18
         10 |         94        0.94        5.12
         11 |          1        0.01        5.13
         12 |          8        0.08        5.21
         13 |         29        0.29        5.50
         14 |          1        0.01        5.51
         15 |         78        0.78        6.29
         16 |          3        0.03        6.32
         17 |          7        0.07        6.39
         18 |          9        0.09        6.48
         19 |          2        0.02        6.50
         20 |        116        1.16        7.66
         21 |          2        0.02        7.68
         22 |          4        0.04        7.72
         23 |         23        0.23        7.95
         24 |          3        0.03        7.98
         25 |        126        1.26        9.24
         26 |          7        0.07        9.31
         27 |         12        0.12        9.43
         28 |         46        0.46        9.89
         29 |          6        0.06        9.95
         30 |        181        1.81       11.76
         31 |          5        0.05       11.81
         32 |         12        0.12       11.93
         33 |         51        0.51       12.44
         34 |         12        0.12       12.56
         35 |        276        2.76       15.32
         36 |          7        0.07       15.39
         37 |         12        0.12       15.51
         38 |         90        0.90       16.41
         39 |          7        0.07       16.48
         40 |        311        3.11       19.59
         41 |          9        0.09       19.68
         42 |         15        0.15       19.83
         43 |         89        0.89       20.72
         44 |         14        0.14       20.86
         45 |        398        3.98       24.84
         46 |         18        0.18       25.02
         47 |         11        0.11       25.13
         48 |         91        0.91       26.04
         49 |          8        0.08       26.12
         50 |        506        5.06       31.18
         51 |         10        0.10       31.28
         52 |          8        0.08       31.36
         53 |        132        1.32       32.68
         54 |         19        0.19       32.87
         55 |        799        7.99       40.86
         56 |         14        0.14       41.00
         57 |         19        0.19       41.19
         58 |        114        1.14       42.33
         59 |         15        0.15       42.48
         60 |        292        2.92       45.40
         61 |         13        0.13       45.53
         62 |         18        0.18       45.71
         63 |         51        0.51       46.22
         64 |          9        0.09       46.31
         65 |        176        1.76       48.07
         66 |         18        0.18       48.25
         67 |         14        0.14       48.39
         68 |         42        0.42       48.81
         69 |         11        0.11       48.92
         70 |        174        1.74       50.66
         71 |          8        0.08       50.74
         72 |         14        0.14       50.88
         73 |         22        0.22       51.10
         74 |          8        0.08       51.18
         75 |        107        1.07       52.25
         76 |          3        0.03       52.28
         77 |          3        0.03       52.31
         78 |         25        0.25       52.56
         79 |          4        0.04       52.60
         80 |         70        0.70       53.30
         81 |          3        0.03       53.33
         82 |          8        0.08       53.41
         83 |         15        0.15       53.56
         84 |          4        0.04       53.60
         85 |         28        0.28       53.88
         86 |          4        0.04       53.92
         87 |          3        0.03       53.95
         88 |          9        0.09       54.04
         89 |          3        0.03       54.07
         90 |         31        0.31       54.38
         91 |          1        0.01       54.39
         92 |          4        0.04       54.43
         93 |          2        0.02       54.45
         94 |          3        0.03       54.48
         95 |         10        0.10       54.58
         96 |          1        0.01       54.59
         97 |         51        0.51       55.10
         99 |      4,490       44.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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