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

CONSTR/MAIN |
     T ZONE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,657       96.57       96.57
          1 |        265        2.65       99.22
          2 |         40        0.40       99.62
          3 |          2        0.02       99.64
          4 |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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