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

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,771       87.71       87.71
          6 |         12        0.12       87.83
          8 |         21        0.21       88.04
         13 |          1        0.01       88.05
         16 |          2        0.02       88.07
         18 |          1        0.01       88.08
         20 |          1        0.01       88.09
         21 |          1        0.01       88.10
         23 |          2        0.02       88.12
         24 |          3        0.03       88.15
         26 |         14        0.14       88.29
         27 |          9        0.09       88.38
         28 |         60        0.60       88.98
         29 |          3        0.03       89.01
         30 |          1        0.01       89.02
         33 |          9        0.09       89.11
         34 |          1        0.01       89.12
         35 |         10        0.10       89.22
         36 |         55        0.55       89.77
         37 |         23        0.23       90.00
         38 |         77        0.77       90.77
         39 |         85        0.85       91.62
         40 |          1        0.01       91.63
         41 |          1        0.01       91.64
         48 |         48        0.48       92.12
         51 |         24        0.24       92.36
         52 |         16        0.16       92.52
         53 |         10        0.10       92.62
         54 |          1        0.01       92.63
         57 |          7        0.07       92.70
         58 |         88        0.88       93.58
         59 |          2        0.02       93.60
         73 |          9        0.09       93.69
         74 |          5        0.05       93.74
         80 |          3        0.03       93.77
         82 |          4        0.04       93.81
         83 |          5        0.05       93.86
         84 |          4        0.04       93.90
         85 |          5        0.05       93.95
         86 |          2        0.02       93.97
         87 |         27        0.27       94.24
         88 |          4        0.04       94.28
         89 |          1        0.01       94.29
         91 |         81        0.81       95.10
         99 |        490        4.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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