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

     TRAVEL |
      SPEED |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        385        3.85        3.85
          1 |          6        0.06        3.91
          2 |          4        0.04        3.95
          3 |         10        0.10        4.05
          4 |          8        0.08        4.13
          5 |         63        0.63        4.76
          6 |          3        0.03        4.79
          7 |          7        0.07        4.86
          8 |         26        0.26        5.12
          9 |          4        0.04        5.16
         10 |         93        0.93        6.09
         12 |          6        0.06        6.15
         13 |         22        0.22        6.37
         14 |          2        0.02        6.39
         15 |         82        0.82        7.21
         16 |          4        0.04        7.25
         17 |          3        0.03        7.28
         18 |         21        0.21        7.49
         19 |          2        0.02        7.51
         20 |         61        0.61        8.12
         21 |          4        0.04        8.16
         22 |          4        0.04        8.20
         23 |         14        0.14        8.34
         24 |          3        0.03        8.37
         25 |         57        0.57        8.94
         26 |          2        0.02        8.96
         27 |          3        0.03        8.99
         28 |         31        0.31        9.30
         30 |        103        1.03       10.33
         31 |         12        0.12       10.45
         32 |          7        0.07       10.52
         33 |         45        0.45       10.97
         34 |         11        0.11       11.08
         35 |        185        1.85       12.93
         36 |         16        0.16       13.09
         37 |          7        0.07       13.16
         38 |         67        0.67       13.83
         39 |         16        0.16       13.99
         40 |        284        2.84       16.83
         41 |         15        0.15       16.98
         42 |         15        0.15       17.13
         43 |         75        0.75       17.88
         44 |         12        0.12       18.00
         45 |        375        3.75       21.75
         46 |         10        0.10       21.85
         47 |          8        0.08       21.93
         48 |         83        0.83       22.76
         49 |         13        0.13       22.89
         50 |        356        3.56       26.45
         51 |         19        0.19       26.64
         52 |          7        0.07       26.71
         53 |         86        0.86       27.57
         54 |         15        0.15       27.72
         55 |        621        6.21       33.93
         56 |         14        0.14       34.07
         57 |         15        0.15       34.22
         58 |         95        0.95       35.17
         59 |          6        0.06       35.23
         60 |        290        2.90       38.13
         61 |         11        0.11       38.24
         62 |         11        0.11       38.35
         63 |         67        0.67       39.02
         64 |         10        0.10       39.12
         65 |        540        5.40       44.52
         66 |         12        0.12       44.64
         67 |          9        0.09       44.73
         68 |        106        1.06       45.79
         69 |          9        0.09       45.88
         70 |        356        3.56       49.44
         71 |          7        0.07       49.51
         72 |         11        0.11       49.62
         73 |         59        0.59       50.21
         74 |          6        0.06       50.27
         75 |        202        2.02       52.29
         76 |          6        0.06       52.35
         77 |          7        0.07       52.42
         78 |         32        0.32       52.74
         79 |          9        0.09       52.83
         80 |        119        1.19       54.02
         81 |          8        0.08       54.10
         82 |          2        0.02       54.12
         83 |         10        0.10       54.22
         84 |          3        0.03       54.25
         85 |         67        0.67       54.92
         86 |          5        0.05       54.97
         87 |          5        0.05       55.02
         88 |         12        0.12       55.14
         89 |          1        0.01       55.15
         90 |         62        0.62       55.77
         91 |          4        0.04       55.81
         92 |          3        0.03       55.84
         93 |          7        0.07       55.91
         94 |          2        0.02       55.93
         95 |         17        0.17       56.10
         96 |          2        0.02       56.12
         97 |         87        0.87       56.99
         98 |      3,247       32.47       89.46
         99 |      1,054       10.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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