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

  work zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,792       97.92       97.92
          1 |        116        1.16       99.08
          2 |         27        0.27       99.35
          3 |          3        0.03       99.38
          4 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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