Frequencies for first 10,000 rows of dr_sf2 variable in vehicle dataset :

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,794       87.94       87.94
          6 |         10        0.10       88.04
          8 |         17        0.17       88.21
         12 |          1        0.01       88.22
         16 |          3        0.03       88.25
         20 |          1        0.01       88.26
         23 |          3        0.03       88.29
         24 |         14        0.14       88.43
         26 |          6        0.06       88.49
         27 |          5        0.05       88.54
         28 |         73        0.73       89.27
         29 |          1        0.01       89.28
         30 |          1        0.01       89.29
         31 |          4        0.04       89.33
         33 |          8        0.08       89.41
         34 |          2        0.02       89.43
         35 |         13        0.13       89.56
         36 |         45        0.45       90.01
         37 |         23        0.23       90.24
         38 |         82        0.82       91.06
         39 |         86        0.86       91.92
         40 |          1        0.01       91.93
         41 |          1        0.01       91.94
         45 |          2        0.02       91.96
         47 |          1        0.01       91.97
         48 |         52        0.52       92.49
         50 |          1        0.01       92.50
         51 |         18        0.18       92.68
         52 |         15        0.15       92.83
         53 |         11        0.11       92.94
         54 |          2        0.02       92.96
         57 |          7        0.07       93.03
         58 |        116        1.16       94.19
         59 |          1        0.01       94.20
         73 |         18        0.18       94.38
         74 |         11        0.11       94.49
         79 |          2        0.02       94.51
         80 |          4        0.04       94.55
         81 |          2        0.02       94.57
         82 |          1        0.01       94.58
         83 |          1        0.01       94.59
         84 |          4        0.04       94.63
         85 |          5        0.05       94.68
         86 |          1        0.01       94.69
         87 |         18        0.18       94.87
         88 |          1        0.01       94.88
         89 |          5        0.05       94.93
         91 |         79        0.79       95.72
         99 |        428        4.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016