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

     TRAVEL |
      SPEED |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        419        4.19        4.19
          1 |          2        0.02        4.21
          2 |          3        0.03        4.24
          3 |          8        0.08        4.32
          4 |          6        0.06        4.38
          5 |         82        0.82        5.20
          6 |          1        0.01        5.21
          7 |          9        0.09        5.30
          8 |         10        0.10        5.40
          9 |          3        0.03        5.43
         10 |         86        0.86        6.29
         11 |          5        0.05        6.34
         12 |          6        0.06        6.40
         13 |         17        0.17        6.57
         14 |          4        0.04        6.61
         15 |         77        0.77        7.38
         16 |          8        0.08        7.46
         17 |          9        0.09        7.55
         18 |         12        0.12        7.67
         19 |          7        0.07        7.74
         20 |         56        0.56        8.30
         21 |          2        0.02        8.32
         22 |          7        0.07        8.39
         23 |         10        0.10        8.49
         25 |         87        0.87        9.36
         26 |          2        0.02        9.38
         27 |          9        0.09        9.47
         28 |         18        0.18        9.65
         29 |          2        0.02        9.67
         30 |         98        0.98       10.65
         31 |          4        0.04       10.69
         32 |         10        0.10       10.79
         33 |         27        0.27       11.06
         34 |          4        0.04       11.10
         35 |        152        1.52       12.62
         36 |          5        0.05       12.67
         37 |         11        0.11       12.78
         38 |         45        0.45       13.23
         39 |          8        0.08       13.31
         40 |        259        2.59       15.90
         41 |          7        0.07       15.97
         42 |         16        0.16       16.13
         43 |         59        0.59       16.72
         44 |         10        0.10       16.82
         45 |        343        3.43       20.25
         46 |         12        0.12       20.37
         47 |         11        0.11       20.48
         48 |         51        0.51       20.99
         49 |          7        0.07       21.06
         50 |        349        3.49       24.55
         51 |          9        0.09       24.64
         52 |         13        0.13       24.77
         53 |         70        0.70       25.47
         54 |         14        0.14       25.61
         55 |        575        5.75       31.36
         56 |          8        0.08       31.44
         57 |         24        0.24       31.68
         58 |         61        0.61       32.29
         59 |         10        0.10       32.39
         60 |        306        3.06       35.45
         61 |          4        0.04       35.49
         62 |         13        0.13       35.62
         63 |         49        0.49       36.11
         64 |          8        0.08       36.19
         65 |        480        4.80       40.99
         66 |         11        0.11       41.10
         67 |         15        0.15       41.25
         68 |         70        0.70       41.95
         69 |          6        0.06       42.01
         70 |        328        3.28       45.29
         71 |          5        0.05       45.34
         72 |          9        0.09       45.43
         73 |         25        0.25       45.68
         74 |          5        0.05       45.73
         75 |        179        1.79       47.52
         76 |          8        0.08       47.60
         77 |          8        0.08       47.68
         78 |         18        0.18       47.86
         79 |          7        0.07       47.93
         80 |        153        1.53       49.46
         81 |          1        0.01       49.47
         82 |          6        0.06       49.53
         83 |         15        0.15       49.68
         84 |          3        0.03       49.71
         85 |         64        0.64       50.35
         86 |          6        0.06       50.41
         87 |          7        0.07       50.48
         88 |          7        0.07       50.55
         89 |          2        0.02       50.57
         90 |         65        0.65       51.22
         91 |          3        0.03       51.25
         93 |          6        0.06       51.31
         94 |          2        0.02       51.33
         95 |         20        0.20       51.53
         96 |          1        0.01       51.54
         97 |         77        0.77       52.31
         98 |      3,417       34.17       86.48
         99 |      1,352       13.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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