Frequencies for first 10,000 rows of c_m_zone variable in accident dataset :

Constructio |
n/Maintenan |
    ce Zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,843       98.43       98.43
          1 |        103        1.03       99.46
          2 |         16        0.16       99.62
          3 |          1        0.01       99.63
          4 |         37        0.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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