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

  work zone |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,793       97.93       97.93
          1 |        124        1.24       99.17
          2 |         29        0.29       99.46
          3 |          4        0.04       99.50
          4 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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