Frequencies for c_m_zone variable in accident dataset :

Constructio |
n/Maintenan |
    ce Zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |        489      100.00      100.00
------------+-----------------------------------
      Total |        489      100.00

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