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 |        149        1.49       99.41
          2 |         17        0.17       99.58
          3 |          5        0.05       99.63
          4 |         37        0.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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