Frequencies for first 10,000 rows of dr_sf3 variable in vehicle dataset :

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,466       94.66       94.66
          6 |          3        0.03       94.69
          8 |          2        0.02       94.71
         16 |          1        0.01       94.72
         26 |          1        0.01       94.73
         27 |          1        0.01       94.74
         28 |          2        0.02       94.76
         31 |          1        0.01       94.77
         33 |          1        0.01       94.78
         35 |          2        0.02       94.80
         36 |          6        0.06       94.86
         37 |          5        0.05       94.91
         38 |          2        0.02       94.93
         39 |         12        0.12       95.05
         40 |          1        0.01       95.06
         47 |          1        0.01       95.07
         48 |          4        0.04       95.11
         51 |          2        0.02       95.13
         52 |          7        0.07       95.20
         53 |          1        0.01       95.21
         54 |          1        0.01       95.22
         57 |          1        0.01       95.23
         58 |          9        0.09       95.32
         73 |          3        0.03       95.35
         74 |          4        0.04       95.39
         81 |          2        0.02       95.41
         84 |          1        0.01       95.42
         85 |          2        0.02       95.44
         87 |          2        0.02       95.46
         88 |          1        0.01       95.47
         91 |         25        0.25       95.72
         99 |        428        4.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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