Frequencies for first 10,000 rows of haz_carg variable in vehicle dataset :

  Hazardous |
      Cargo |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,901       99.01       99.01
          1 |         14        0.14       99.15
          9 |         85        0.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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