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

     Driver |
    Related |
 Factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,408       94.08       94.08
          4 |          1        0.01       94.09
          8 |          2        0.02       94.11
         18 |          1        0.01       94.12
         21 |          1        0.01       94.13
         24 |         10        0.10       94.23
         27 |          2        0.02       94.25
         28 |          7        0.07       94.32
         33 |          4        0.04       94.36
         34 |          1        0.01       94.37
         35 |          1        0.01       94.38
         36 |          9        0.09       94.47
         37 |         11        0.11       94.58
         38 |          1        0.01       94.59
         39 |          8        0.08       94.67
         48 |         10        0.10       94.77
         51 |          1        0.01       94.78
         52 |          6        0.06       94.84
         53 |          1        0.01       94.85
         58 |          7        0.07       94.92
         73 |          2        0.02       94.94
         74 |          8        0.08       95.02
         79 |          3        0.03       95.05
         83 |          1        0.01       95.06
         85 |          1        0.01       95.07
         87 |          2        0.02       95.09
         91 |         11        0.11       95.20
         92 |         57        0.57       95.77
         99 |        423        4.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016