Frequencies for first 10,000 rows of veh_cf2 variable in vehicle dataset :

    RELATED |
   FACTOR 2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,895       98.95       98.95
          2 |          1        0.01       98.96
          3 |          2        0.02       98.98
          4 |          1        0.01       98.99
          9 |          2        0.02       99.01
         13 |          1        0.01       99.02
         15 |          2        0.02       99.04
         18 |          2        0.02       99.06
         31 |          5        0.05       99.11
         33 |          1        0.01       99.12
         39 |          1        0.01       99.13
         99 |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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