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

  HAZARDOUS |
MATERIAL-RE |
      LEASE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,973       99.73       99.73
          1 |         13        0.13       99.86
          2 |          8        0.08       99.94
          8 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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