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

     TRAVEL |
      SPEED |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        314        3.14        3.14
          1 |          1        0.01        3.15
          2 |         14        0.14        3.29
          3 |         22        0.22        3.51
          4 |          7        0.07        3.58
          5 |         86        0.86        4.44
          6 |          3        0.03        4.47
          7 |          7        0.07        4.54
          8 |         33        0.33        4.87
          9 |          3        0.03        4.90
         10 |        101        1.01        5.91
         11 |          4        0.04        5.95
         12 |         10        0.10        6.05
         13 |         42        0.42        6.47
         14 |          3        0.03        6.50
         15 |         81        0.81        7.31
         16 |          3        0.03        7.34
         17 |          3        0.03        7.37
         18 |         25        0.25        7.62
         19 |          4        0.04        7.66
         20 |         64        0.64        8.30
         21 |          6        0.06        8.36
         22 |          2        0.02        8.38
         23 |         37        0.37        8.75
         24 |          2        0.02        8.77
         25 |        100        1.00        9.77
         26 |          2        0.02        9.79
         27 |         13        0.13        9.92
         28 |         44        0.44       10.36
         29 |          2        0.02       10.38
         30 |        161        1.61       11.99
         31 |          6        0.06       12.05
         32 |          7        0.07       12.12
         33 |         78        0.78       12.90
         34 |         10        0.10       13.00
         35 |        243        2.43       15.43
         36 |          5        0.05       15.48
         37 |         14        0.14       15.62
         38 |        109        1.09       16.71
         39 |         12        0.12       16.83
         40 |        333        3.33       20.16
         41 |         10        0.10       20.26
         42 |         14        0.14       20.40
         43 |        105        1.05       21.45
         44 |         10        0.10       21.55
         45 |        364        3.64       25.19
         46 |         11        0.11       25.30
         47 |         13        0.13       25.43
         48 |         98        0.98       26.41
         49 |         11        0.11       26.52
         50 |        491        4.91       31.43
         51 |         13        0.13       31.56
         52 |         12        0.12       31.68
         53 |        134        1.34       33.02
         54 |         18        0.18       33.20
         55 |        972        9.72       42.92
         56 |         15        0.15       43.07
         57 |         12        0.12       43.19
         58 |        141        1.41       44.60
         59 |         10        0.10       44.70
         60 |        306        3.06       47.76
         61 |          6        0.06       47.82
         62 |         18        0.18       48.00
         63 |         87        0.87       48.87
         64 |          9        0.09       48.96
         65 |        384        3.84       52.80
         66 |          5        0.05       52.85
         67 |         15        0.15       53.00
         68 |         69        0.69       53.69
         69 |          6        0.06       53.75
         70 |        205        2.05       55.80
         71 |          5        0.05       55.85
         72 |          9        0.09       55.94
         73 |         32        0.32       56.26
         74 |          5        0.05       56.31
         75 |        111        1.11       57.42
         76 |          6        0.06       57.48
         77 |          6        0.06       57.54
         78 |         24        0.24       57.78
         79 |          3        0.03       57.81
         80 |        104        1.04       58.85
         81 |          2        0.02       58.87
         82 |          6        0.06       58.93
         83 |         10        0.10       59.03
         85 |         34        0.34       59.37
         86 |          5        0.05       59.42
         87 |          3        0.03       59.45
         88 |          9        0.09       59.54
         89 |          4        0.04       59.58
         90 |         51        0.51       60.09
         91 |          4        0.04       60.13
         93 |          6        0.06       60.19
         95 |          7        0.07       60.26
         96 |          2        0.02       60.28
         97 |         62        0.62       60.90
         99 |      3,910       39.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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