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

     TRAVEL |
      SPEED |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        276        2.76        2.76
          2 |          7        0.07        2.83
          3 |         18        0.18        3.01
          4 |          9        0.09        3.10
          5 |         94        0.94        4.04
          6 |          1        0.01        4.05
          7 |          1        0.01        4.06
          8 |         26        0.26        4.32
          9 |          4        0.04        4.36
         10 |        106        1.06        5.42
         11 |          2        0.02        5.44
         12 |          4        0.04        5.48
         13 |         24        0.24        5.72
         14 |          5        0.05        5.77
         15 |         86        0.86        6.63
         16 |          2        0.02        6.65
         17 |          5        0.05        6.70
         18 |         30        0.30        7.00
         20 |         73        0.73        7.73
         21 |          3        0.03        7.76
         22 |          2        0.02        7.78
         23 |         17        0.17        7.95
         24 |          4        0.04        7.99
         25 |        108        1.08        9.07
         26 |          4        0.04        9.11
         27 |          5        0.05        9.16
         28 |         32        0.32        9.48
         29 |          7        0.07        9.55
         30 |        144        1.44       10.99
         31 |          3        0.03       11.02
         32 |          6        0.06       11.08
         33 |         63        0.63       11.71
         34 |         10        0.10       11.81
         35 |        250        2.50       14.31
         36 |          9        0.09       14.40
         37 |         14        0.14       14.54
         38 |        104        1.04       15.58
         39 |          6        0.06       15.64
         40 |        285        2.85       18.49
         41 |          6        0.06       18.55
         42 |         16        0.16       18.71
         43 |        111        1.11       19.82
         44 |         11        0.11       19.93
         45 |        443        4.43       24.36
         46 |         11        0.11       24.47
         47 |         21        0.21       24.68
         48 |         75        0.75       25.43
         49 |         10        0.10       25.53
         50 |        406        4.06       29.59
         51 |         10        0.10       29.69
         52 |         11        0.11       29.80
         53 |         85        0.85       30.65
         54 |         13        0.13       30.78
         55 |        767        7.67       38.45
         56 |         21        0.21       38.66
         57 |         20        0.20       38.86
         58 |         74        0.74       39.60
         59 |          7        0.07       39.67
         60 |        398        3.98       43.65
         61 |          9        0.09       43.74
         62 |         18        0.18       43.92
         63 |         90        0.90       44.82
         64 |         12        0.12       44.94
         65 |        514        5.14       50.08
         66 |          7        0.07       50.15
         67 |         10        0.10       50.25
         68 |         73        0.73       50.98
         69 |         10        0.10       51.08
         70 |        317        3.17       54.25
         71 |          6        0.06       54.31
         72 |         11        0.11       54.42
         73 |         21        0.21       54.63
         74 |          7        0.07       54.70
         75 |        184        1.84       56.54
         76 |          8        0.08       56.62
         77 |          8        0.08       56.70
         78 |         26        0.26       56.96
         79 |          6        0.06       57.02
         80 |        111        1.11       58.13
         81 |          8        0.08       58.21
         82 |          3        0.03       58.24
         83 |         10        0.10       58.34
         84 |          6        0.06       58.40
         85 |         53        0.53       58.93
         86 |          1        0.01       58.94
         87 |          9        0.09       59.03
         88 |          8        0.08       59.11
         89 |          6        0.06       59.17
         90 |         46        0.46       59.63
         91 |          2        0.02       59.65
         92 |          3        0.03       59.68
         93 |          1        0.01       59.69
         94 |          4        0.04       59.73
         95 |         11        0.11       59.84
         96 |          2        0.02       59.86
         97 |         61        0.61       60.47
         99 |      3,953       39.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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