Frequencies for minimumtobaccofreemonthsrule variable in busrules2017 dataset :

       Minimum |
  Tobacco Free |
   Months Rule |      Freq.     Percent        Cum.
---------------+-----------------------------------
             4 |         20        0.30        0.30
             6 |      3,358       50.73       51.03
Not Applicable |      3,242       48.97      100.00
---------------+-----------------------------------
         Total |      6,620      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017