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

     Travel |
      Speed |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        250        2.50        2.50
          1 |          2        0.02        2.52
          2 |          7        0.07        2.59
          3 |         16        0.16        2.75
          4 |          6        0.06        2.81
          5 |         70        0.70        3.51
          6 |          5        0.05        3.56
          7 |          5        0.05        3.61
          8 |         22        0.22        3.83
          9 |          2        0.02        3.85
         10 |         77        0.77        4.62
         11 |          1        0.01        4.63
         12 |          5        0.05        4.68
         13 |         22        0.22        4.90
         14 |          2        0.02        4.92
         15 |         70        0.70        5.62
         16 |          1        0.01        5.63
         17 |          9        0.09        5.72
         18 |         13        0.13        5.85
         19 |          3        0.03        5.88
         20 |         56        0.56        6.44
         21 |          3        0.03        6.47
         22 |          2        0.02        6.49
         23 |         16        0.16        6.65
         24 |          1        0.01        6.66
         25 |        103        1.03        7.69
         26 |          4        0.04        7.73
         27 |          3        0.03        7.76
         28 |         33        0.33        8.09
         29 |          6        0.06        8.15
         30 |        142        1.42        9.57
         31 |         10        0.10        9.67
         32 |          6        0.06        9.73
         33 |         64        0.64       10.37
         34 |          6        0.06       10.43
         35 |        236        2.36       12.79
         36 |         11        0.11       12.90
         37 |         11        0.11       13.01
         38 |         85        0.85       13.86
         39 |         14        0.14       14.00
         40 |        331        3.31       17.31
         41 |          7        0.07       17.38
         42 |          4        0.04       17.42
         43 |        100        1.00       18.42
         44 |          5        0.05       18.47
         45 |        380        3.80       22.27
         46 |         17        0.17       22.44
         47 |         14        0.14       22.58
         48 |         99        0.99       23.57
         49 |         14        0.14       23.71
         50 |        401        4.01       27.72
         51 |         13        0.13       27.85
         52 |         19        0.19       28.04
         53 |        144        1.44       29.48
         54 |         10        0.10       29.58
         55 |        790        7.90       37.48
         56 |         15        0.15       37.63
         57 |         21        0.21       37.84
         58 |        162        1.62       39.46
         59 |         10        0.10       39.56
         60 |        351        3.51       43.07
         61 |         10        0.10       43.17
         62 |         11        0.11       43.28
         63 |         72        0.72       44.00
         64 |         12        0.12       44.12
         65 |        348        3.48       47.60
         66 |          6        0.06       47.66
         67 |          7        0.07       47.73
         68 |         61        0.61       48.34
         69 |          6        0.06       48.40
         70 |        178        1.78       50.18
         71 |          1        0.01       50.19
         72 |         10        0.10       50.29
         73 |         31        0.31       50.60
         74 |          3        0.03       50.63
         75 |        122        1.22       51.85
         76 |          3        0.03       51.88
         77 |          5        0.05       51.93
         78 |         27        0.27       52.20
         79 |          6        0.06       52.26
         80 |        128        1.28       53.54
         81 |          5        0.05       53.59
         82 |          5        0.05       53.64
         83 |          8        0.08       53.72
         84 |          2        0.02       53.74
         85 |         51        0.51       54.25
         86 |          2        0.02       54.27
         87 |          1        0.01       54.28
         88 |         15        0.15       54.43
         89 |          2        0.02       54.45
         90 |         32        0.32       54.77
         91 |          2        0.02       54.79
         92 |          5        0.05       54.84
         93 |          3        0.03       54.87
         94 |          2        0.02       54.89
         95 |         13        0.13       55.02
         96 |          1        0.01       55.03
         97 |         62        0.62       55.65
         99 |      4,435       44.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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