Frequencies for dr_cf3 variable in vehicle dataset :

    RELATED |
   FACTOR 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        325       68.86       68.86
         21 |          1        0.21       69.07
         26 |          1        0.21       69.28
         27 |          1        0.21       69.49
         28 |          6        1.27       70.76
         29 |          1        0.21       70.97
         35 |          3        0.64       71.61
         36 |         51       10.81       82.42
         38 |         15        3.18       85.59
         39 |          9        1.91       87.50
         51 |         31        6.57       94.07
         87 |          1        0.21       94.28
         90 |         27        5.72      100.00
------------+-----------------------------------
      Total |        472      100.00

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