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

  Hazardous |
      Cargo |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,926       99.26       99.26
          1 |         30        0.30       99.56
          9 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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