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

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,477       94.77       94.77
          6 |          3        0.03       94.80
          8 |          1        0.01       94.81
         21 |          3        0.03       94.84
         24 |          3        0.03       94.87
         26 |          2        0.02       94.89
         27 |          1        0.01       94.90
         28 |          6        0.06       94.96
         33 |          2        0.02       94.98
         34 |          1        0.01       94.99
         35 |          2        0.02       95.01
         36 |          4        0.04       95.05
         37 |          2        0.02       95.07
         38 |          5        0.05       95.12
         39 |          5        0.05       95.17
         40 |          1        0.01       95.18
         48 |          4        0.04       95.22
         51 |          2        0.02       95.24
         52 |          6        0.06       95.30
         53 |          8        0.08       95.38
         58 |         13        0.13       95.51
         73 |          3        0.03       95.54
         74 |          4        0.04       95.58
         85 |          1        0.01       95.59
         87 |          3        0.03       95.62
         91 |         17        0.17       95.79
         99 |        421        4.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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