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

  HAZARDOUS |
MATERIAL-RE |
      LEASE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,985       99.85       99.85
          1 |          5        0.05       99.90
          2 |          6        0.06       99.96
          8 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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