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

  HAZARDOUS |
MATERIAL-CL |
     ASS NO |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,973       99.73       99.73
          1 |          2        0.02       99.75
          2 |          2        0.02       99.77
          3 |         14        0.14       99.91
          8 |          1        0.01       99.92
          9 |          3        0.03       99.95
         88 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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