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

  work zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,794       97.94       97.94
          1 |        115        1.15       99.09
          2 |         27        0.27       99.36
          3 |          3        0.03       99.39
          4 |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016