Frequencies for first 10,000 rows of dr_cf2 variable in vehicle dataset :

     Driver |
    Related |
   Factor 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,546       65.46       65.46
          1 |         51        0.51       65.97
          2 |          4        0.04       66.01
          4 |          7        0.07       66.08
          5 |         16        0.16       66.24
          6 |        422        4.22       70.46
          7 |          6        0.06       70.52
         21 |          5        0.05       70.57
         22 |          3        0.03       70.60
         23 |         20        0.20       70.80
         24 |         48        0.48       71.28
         25 |          1        0.01       71.29
         26 |         16        0.16       71.45
         27 |         12        0.12       71.57
         28 |        499        4.99       76.56
         29 |          2        0.02       76.58
         30 |         10        0.10       76.68
         31 |          5        0.05       76.73
         33 |         13        0.13       76.86
         34 |          7        0.07       76.93
         35 |         45        0.45       77.38
         36 |         83        0.83       78.21
         38 |        216        2.16       80.37
         39 |        220        2.20       82.57
         40 |          1        0.01       82.58
         42 |          2        0.02       82.60
         44 |        960        9.60       92.20
         47 |          4        0.04       92.24
         48 |        136        1.36       93.60
         49 |          1        0.01       93.61
         50 |         15        0.15       93.76
         51 |        227        2.27       96.03
         52 |         16        0.16       96.19
         53 |         56        0.56       96.75
         99 |        325        3.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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