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

CONSTR/MAIN |
     T ZONE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,833       98.33       98.33
          1 |        126        1.26       99.59
          2 |         12        0.12       99.71
          3 |          1        0.01       99.72
          4 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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