Frequencies for first 10,000 rows of dr_sf1 variable in vehicle dataset :

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,399       53.99       53.99
          4 |          1        0.01       54.00
          6 |        717        7.17       61.17
          8 |        111        1.11       62.28
         13 |          1        0.01       62.29
         15 |          2        0.02       62.31
         16 |          8        0.08       62.39
         19 |          1        0.01       62.40
         20 |         13        0.13       62.53
         21 |          9        0.09       62.62
         23 |         16        0.16       62.78
         24 |         78        0.78       63.56
         26 |         32        0.32       63.88
         27 |         74        0.74       64.62
         28 |        476        4.76       69.38
         29 |          6        0.06       69.44
         30 |          2        0.02       69.46
         31 |         17        0.17       69.63
         33 |         16        0.16       69.79
         34 |          7        0.07       69.86
         35 |         35        0.35       70.21
         36 |        183        1.83       72.04
         37 |         20        0.20       72.24
         38 |        585        5.85       78.09
         39 |        265        2.65       80.74
         40 |          3        0.03       80.77
         41 |          3        0.03       80.80
         42 |          2        0.02       80.82
         45 |          3        0.03       80.85
         47 |          1        0.01       80.86
         48 |        573        5.73       86.59
         50 |          8        0.08       86.67
         51 |        125        1.25       87.92
         52 |          9        0.09       88.01
         53 |         12        0.12       88.13
         54 |         59        0.59       88.72
         58 |        135        1.35       90.07
         73 |         11        0.11       90.18
         74 |         12        0.12       90.30
         80 |         15        0.15       90.45
         81 |          1        0.01       90.46
         82 |          3        0.03       90.49
         83 |          9        0.09       90.58
         84 |         16        0.16       90.74
         85 |         11        0.11       90.85
         86 |         26        0.26       91.11
         87 |         20        0.20       91.31
         88 |          2        0.02       91.33
         89 |        232        2.32       93.65
         91 |         99        0.99       94.64
         99 |        536        5.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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