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

CONSTR/MAIN |
     T ZONE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,704       97.04       97.04
          1 |        247        2.47       99.51
          2 |         20        0.20       99.71
          3 |          3        0.03       99.74
          4 |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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