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

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,769       87.69       87.69
          6 |         22        0.22       87.91
          8 |         15        0.15       88.06
         12 |          3        0.03       88.09
         20 |          1        0.01       88.10
         21 |          2        0.02       88.12
         23 |          6        0.06       88.18
         24 |         26        0.26       88.44
         26 |         10        0.10       88.54
         27 |         17        0.17       88.71
         28 |         72        0.72       89.43
         29 |          1        0.01       89.44
         30 |          4        0.04       89.48
         31 |          2        0.02       89.50
         33 |          9        0.09       89.59
         34 |          3        0.03       89.62
         35 |          8        0.08       89.70
         36 |         48        0.48       90.18
         37 |         29        0.29       90.47
         38 |         64        0.64       91.11
         39 |         91        0.91       92.02
         40 |          1        0.01       92.03
         41 |          1        0.01       92.04
         42 |          1        0.01       92.05
         45 |          1        0.01       92.06
         48 |         76        0.76       92.82
         50 |          3        0.03       92.85
         51 |         19        0.19       93.04
         52 |         13        0.13       93.17
         53 |          9        0.09       93.26
         54 |          1        0.01       93.27
         57 |         10        0.10       93.37
         58 |        110        1.10       94.47
         59 |          1        0.01       94.48
         73 |         10        0.10       94.58
         74 |         16        0.16       94.74
         77 |          1        0.01       94.75
         79 |          1        0.01       94.76
         80 |          6        0.06       94.82
         81 |          2        0.02       94.84
         82 |          1        0.01       94.85
         84 |          2        0.02       94.87
         85 |          6        0.06       94.93
         86 |          1        0.01       94.94
         87 |         20        0.20       95.14
         88 |          1        0.01       95.15
         89 |          5        0.05       95.20
         91 |         59        0.59       95.79
         99 |        421        4.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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