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

Constructio |
n/Maintenan |
    ce Zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,833       98.33       98.33
          1 |        125        1.25       99.58
          2 |         11        0.11       99.69
          3 |          1        0.01       99.70
          4 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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