Frequencies for minimumtobaccofreemonthsrule variable in busrules2015 dataset :

       Minimum |
  Tobacco Free |
   Months Rule |      Freq.     Percent        Cum.
---------------+-----------------------------------
             3 |          4        0.04        0.04
             4 |          9        0.09        0.13
             6 |      5,861       58.06       58.19
Not Applicable |      4,221       41.81      100.00
---------------+-----------------------------------
         Total |     10,095      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017