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

     Travel |
      Speed |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        294        2.94        2.94
          1 |          1        0.01        2.95
          2 |          9        0.09        3.04
          3 |          9        0.09        3.13
          4 |          8        0.08        3.21
          5 |         73        0.73        3.94
          6 |          5        0.05        3.99
          7 |          2        0.02        4.01
          8 |         33        0.33        4.34
          9 |          1        0.01        4.35
         10 |         94        0.94        5.29
         11 |          1        0.01        5.30
         12 |          4        0.04        5.34
         13 |         12        0.12        5.46
         14 |          1        0.01        5.47
         15 |         68        0.68        6.15
         16 |          1        0.01        6.16
         17 |          2        0.02        6.18
         18 |         23        0.23        6.41
         19 |          4        0.04        6.45
         20 |         65        0.65        7.10
         22 |          3        0.03        7.13
         23 |         18        0.18        7.31
         24 |          2        0.02        7.33
         25 |        113        1.13        8.46
         26 |          6        0.06        8.52
         27 |          6        0.06        8.58
         28 |         39        0.39        8.97
         29 |          3        0.03        9.00
         30 |        186        1.86       10.86
         31 |          9        0.09       10.95
         32 |          8        0.08       11.03
         33 |         50        0.50       11.53
         34 |          6        0.06       11.59
         35 |        272        2.72       14.31
         36 |          8        0.08       14.39
         37 |         14        0.14       14.53
         38 |         84        0.84       15.37
         39 |          5        0.05       15.42
         40 |        339        3.39       18.81
         41 |         10        0.10       18.91
         42 |          8        0.08       18.99
         43 |         91        0.91       19.90
         44 |         15        0.15       20.05
         45 |        343        3.43       23.48
         46 |         13        0.13       23.61
         47 |         13        0.13       23.74
         48 |        126        1.26       25.00
         49 |          6        0.06       25.06
         50 |        479        4.79       29.85
         51 |         12        0.12       29.97
         52 |         15        0.15       30.12
         53 |        131        1.31       31.43
         54 |         16        0.16       31.59
         55 |        837        8.37       39.96
         56 |         15        0.15       40.11
         57 |         35        0.35       40.46
         58 |        164        1.64       42.10
         59 |         10        0.10       42.20
         60 |        244        2.44       44.64
         61 |          6        0.06       44.70
         62 |         13        0.13       44.83
         63 |         60        0.60       45.43
         64 |          8        0.08       45.51
         65 |        179        1.79       47.30
         66 |         12        0.12       47.42
         67 |          9        0.09       47.51
         68 |         25        0.25       47.76
         69 |          6        0.06       47.82
         70 |        192        1.92       49.74
         71 |          5        0.05       49.79
         72 |          8        0.08       49.87
         73 |         29        0.29       50.16
         74 |          7        0.07       50.23
         75 |        103        1.03       51.26
         76 |          2        0.02       51.28
         77 |          4        0.04       51.32
         78 |         20        0.20       51.52
         79 |          3        0.03       51.55
         80 |        101        1.01       52.56
         81 |          5        0.05       52.61
         82 |          6        0.06       52.67
         83 |          9        0.09       52.76
         84 |          3        0.03       52.79
         85 |         44        0.44       53.23
         86 |          2        0.02       53.25
         87 |          5        0.05       53.30
         88 |          7        0.07       53.37
         89 |          2        0.02       53.39
         90 |         33        0.33       53.72
         91 |          1        0.01       53.73
         92 |          3        0.03       53.76
         93 |          6        0.06       53.82
         95 |         11        0.11       53.93
         96 |          1        0.01       53.94
         97 |         37        0.37       54.31
         99 |      4,569       45.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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