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

  work zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,777       97.77       97.77
          1 |        139        1.39       99.16
          2 |         22        0.22       99.38
          3 |          3        0.03       99.41
          4 |         59        0.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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