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

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,337       93.37       93.37
          6 |          4        0.04       93.41
          8 |          1        0.01       93.42
         20 |          1        0.01       93.43
         23 |          1        0.01       93.44
         28 |          4        0.04       93.48
         30 |          1        0.01       93.49
         34 |          2        0.02       93.51
         35 |          1        0.01       93.52
         36 |         10        0.10       93.62
         37 |          7        0.07       93.69
         38 |          5        0.05       93.74
         39 |         15        0.15       93.89
         42 |          1        0.01       93.90
         48 |          2        0.02       93.92
         51 |          5        0.05       93.97
         52 |          7        0.07       94.04
         53 |          9        0.09       94.13
         58 |         16        0.16       94.29
         73 |          4        0.04       94.33
         74 |          7        0.07       94.40
         83 |          1        0.01       94.41
         87 |          3        0.03       94.44
         89 |          3        0.03       94.47
         91 |         17        0.17       94.64
         99 |        536        5.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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