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

  Work Zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,797       97.97       97.97
          1 |        131        1.31       99.28
          2 |         30        0.30       99.58
          3 |          3        0.03       99.61
          4 |         32        0.32       99.93
          8 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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