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

  Work Zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,810       98.10       98.10
          1 |        108        1.08       99.18
          2 |         24        0.24       99.42
          3 |          3        0.03       99.45
          4 |         52        0.52       99.97
          8 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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