使用數據集：
http://archive.ics.uci.edu/ml/machine-learning-databases/car/
weka-3.6.10的結果是：

safety = low: unacc (576.0) safety = med | persons = 2.0: unacc (192.0) | persons = 4.0 | | buying = vhigh | | | maint = vhigh: unacc (12.0) | | | maint = high: unacc (12.0) | | | maint = med | | | | lug_boot = small: unacc (4.0) | | | | lug_boot = med: unacc (4.0/2.0) | | | | lug_boot = big: acc (4.0) | | | maint = low | | | | lug_boot = small: unacc (4.0) | | | | lug_boot = med: unacc (4.0/2.0) | | | | lug_boot = big: acc (4.0) | | buying = high | | | lug_boot = small: unacc (16.0) | | | lug_boot = med | | | | doors = 2.0: unacc (4.0) | | | | doors = 3.0: unacc (4.0) | | | | doors = 4.0: acc (4.0/1.0) | | | | doors = 5more: acc (4.0/1.0) | | | lug_boot = big | | | | maint = vhigh: unacc (4.0) | | | | maint = high: acc (4.0) | | | | maint = med: acc (4.0) | | | | maint = low: acc (4.0) | | buying = med | | | maint = vhigh | | | | lug_boot = small: unacc (4.0) | | | | lug_boot = med: unacc (4.0/2.0) | | | | lug_boot = big: acc (4.0) | | | maint = high | | | | lug_boot = small: unacc (4.0) | | | | lug_boot = med: unacc (4.0/2.0) | | | | lug_boot = big: acc (4.0) | | | maint = med: acc (12.0) | | | maint = low | | | | lug_boot = small: acc (4.0) | | | | lug_boot = med: acc (4.0/2.0) | | | | lug_boot = big: good (4.0) | | buying = low | | | maint = vhigh | | | | lug_boot = small: unacc (4.0) | | | | lug_boot = med: unacc (4.0/2.0) | | | | lug_boot = big: acc (4.0) | | | maint = high: acc (12.0) | | | maint = med | | | | lug_boot = small: acc (4.0) | | | | lug_boot = med: acc (4.0/2.0) | | | | lug_boot = big: good (4.0) | | | maint = low | | | | lug_boot = small: acc (4.0) | | | | lug_boot = med: acc (4.0/2.0) | | | | lug_boot = big: good (4.0) | persons = more | | lug_boot = small | | | buying = vhigh: unacc (16.0) | | | buying = high: unacc (16.0) | | | buying = med | | | | maint = vhigh: unacc (4.0) | | | | maint = high: unacc (4.0) | | | | maint = med: acc (4.0/1.0) | | | | maint = low: acc (4.0/1.0) | | | buying = low | | | | maint = vhigh: unacc (4.0) | | | | maint = high: acc (4.0/1.0) | | | | maint = med: acc (4.0/1.0) | | | | maint = low: acc (4.0/1.0) | | lug_boot = med | | | buying = vhigh | | | | maint = vhigh: unacc (4.0) | | | | maint = high: unacc (4.0) | | | | maint = med: acc (4.0/1.0) | | | | maint = low: acc (4.0/1.0) | | | buying = high | | | | maint = vhigh: unacc (4.0) | | | | maint = high: acc (4.0/1.0) | | | | maint = med: acc (4.0/1.0) | | | | maint = low: acc (4.0/1.0) | | | buying = med: acc (16.0/5.0) | | | buying = low | | | | maint = vhigh: acc (4.0/1.0) | | | | maint = high: acc (4.0) | | | | maint = med: good (4.0/1.0) | | | | maint = low: good (4.0/1.0) | | lug_boot = big | | | buying = vhigh | | | | maint = vhigh: unacc (4.0) | | | | maint = high: unacc (4.0) | | | | maint = med: acc (4.0) | | | | maint = low: acc (4.0) | | | buying = high | | | | maint = vhigh: unacc (4.0) | | | | maint = high: acc (4.0) | | | | maint = med: acc (4.0) | | | | maint = low: acc (4.0) | | | buying = med | | | | maint = vhigh: acc (4.0) | | | | maint = high: acc (4.0) | | | | maint = med: acc (4.0) | | | | maint = low: good (4.0) | | | buying = low | | | | maint = vhigh: acc (4.0) | | | | maint = high: acc (4.0) | | | | maint = med: good (4.0) | | | | maint = low: good (4.0) safety = high | persons = 2.0: unacc (192.0) | persons = 4.0 | | buying = vhigh | | | maint = vhigh: unacc (12.0) | | | maint = high: unacc (12.0) | | | maint = med: acc (12.0) | | | maint = low: acc (12.0) | | buying = high | | | maint = vhigh: unacc (12.0) | | | maint = high: acc (12.0) | | | maint = med: acc (12.0) | | | maint = low: acc (12.0) | | buying = med | | | maint = vhigh: acc (12.0) | | | maint = high: acc (12.0) | | | maint = med | | | | lug_boot = small: acc (4.0) | | | | lug_boot = med: acc (4.0/2.0) | | | | lug_boot = big: vgood (4.0) | | | maint = low | | | | lug_boot = small: good (4.0) | | | | lug_boot = med: vgood (4.0/2.0) | | | | lug_boot = big: vgood (4.0) | | buying = low | | | maint = vhigh: acc (12.0) | | | maint = high | | | | lug_boot = small: acc (4.0) | | | | lug_boot = med: acc (4.0/2.0) | | | | lug_boot = big: vgood (4.0) | | | maint = med | | | | lug_boot = small: good (4.0) | | | | lug_boot = med: vgood (4.0/2.0) | | | | lug_boot = big: vgood (4.0) | | | maint = low | | | | lug_boot = small: good (4.0) | | | | lug_boot = med: vgood (4.0/2.0) | | | | lug_boot = big: vgood (4.0) | persons = more | | buying = vhigh | | | maint = vhigh: unacc (12.0) | | | maint = high: unacc (12.0) | | | maint = med: acc (12.0/1.0) | | | maint = low: acc (12.0/1.0) | | buying = high | | | maint = vhigh: unacc (12.0) | | | maint = high: acc (12.0/1.0) | | | maint = med: acc (12.0/1.0) | | | maint = low: acc (12.0/1.0) | | buying = med | | | maint = vhigh: acc (12.0/1.0) | | | maint = high: acc (12.0/1.0) | | | maint = med | | | | lug_boot = small: acc (4.0/1.0) | | | | lug_boot = med: vgood (4.0/1.0) | | | | lug_boot = big: vgood (4.0) | | | maint = low | | | | lug_boot = small: good (4.0/1.0) | | | | lug_boot = med: vgood (4.0/1.0) | | | | lug_boot = big: vgood (4.0) | | buying = low | | | maint = vhigh: acc (12.0/1.0) | | | maint = high | | | | lug_boot = small: acc (4.0/1.0) | | | | lug_boot = med: vgood (4.0/1.0) | | | | lug_boot = big: vgood (4.0) | | | maint = med | | | | lug_boot = small: good (4.0/1.0) | | | | lug_boot = med: vgood (4.0/1.0) | | | | lug_boot = big: vgood (4.0) | | | maint = low | | | | lug_boot = small: good (4.0/1.0) | | | | lug_boot = med: vgood (4.0/1.0) | | | | lug_boot = big: vgood (4.0)

Ross Quinlan的C4.5-Release8的代碼是：
http://www.rulequest.com/Personal/c4.5r8.tar.gz

運行結果是：

safety = low: unacc (576.0/1.4) safety = med: | persons = 2: unacc (192.0/1.4) | persons = 4: | | buying = vhigh: | | | maint = vhigh: unacc (12.0/1.3) | | | maint = high: unacc (12.0/1.3) | | | maint = med: | | | | lug_boot = small: unacc (4.0/1.2) | | | | lug_boot = med: unacc (4.0/3.1) | | | | lug_boot = big: acc (4.0/1.2) | | | maint = low: | | | | lug_boot = small: unacc (4.0/1.2) | | | | lug_boot = med: unacc (4.0/3.1) | | | | lug_boot = big: acc (4.0/1.2) | | buying = high: | | | lug_boot = small: unacc (16.0/1.3) | | | lug_boot = med: | | | | doors = 2: unacc (4.0/1.2) | | | | doors = 3: unacc (4.0/1.2) | | | | doors = 4: acc (4.0/2.2) | | | | doors = 5more: acc (4.0/2.2) | | | lug_boot = big: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: acc (4.0/1.2) | | | | maint = med: acc (4.0/1.2) | | | | maint = low: acc (4.0/1.2) | | buying = med: | | | maint = med: acc (12.0/1.3) | | | maint = vhigh: | | | | lug_boot = small: unacc (4.0/1.2) | | | | lug_boot = med: unacc (4.0/3.1) | | | | lug_boot = big: acc (4.0/1.2) | | | maint = high: | | | | lug_boot = small: unacc (4.0/1.2) | | | | lug_boot = med: unacc (4.0/3.1) | | | | lug_boot = big: acc (4.0/1.2) | | | maint = low: | | | | lug_boot = small: acc (4.0/1.2) | | | | lug_boot = med: acc (4.0/3.1) | | | | lug_boot = big: good (4.0/1.2) | | buying = low: | | | maint = high: acc (12.0/1.3) | | | maint = vhigh: | | | | lug_boot = small: unacc (4.0/1.2) | | | | lug_boot = med: unacc (4.0/3.1) | | | | lug_boot = big: acc (4.0/1.2) | | | maint = med: | | | | lug_boot = small: acc (4.0/1.2) | | | | lug_boot = med: acc (4.0/3.1) | | | | lug_boot = big: good (4.0/1.2) | | | maint = low: | | | | lug_boot = small: acc (4.0/1.2) | | | | lug_boot = med: acc (4.0/3.1) | | | | lug_boot = big: good (4.0/1.2) | persons = more: | | lug_boot = small: | | | buying = vhigh: unacc (16.0/1.3) | | | buying = high: unacc (16.0/1.3) | | | buying = med: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: unacc (4.0/1.2) | | | | maint = med: acc (4.0/2.2) | | | | maint = low: acc (4.0/2.2) | | | buying = low: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: acc (4.0/2.2) | | | | maint = med: acc (4.0/2.2) | | | | maint = low: acc (4.0/2.2) | | lug_boot = med: | | | buying = med: acc (16.0/6.9) | | | buying = vhigh: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: unacc (4.0/1.2) | | | | maint = med: acc (4.0/2.2) | | | | maint = low: acc (4.0/2.2) | | | buying = high: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: acc (4.0/2.2) | | | | maint = med: acc (4.0/2.2) | | | | maint = low: acc (4.0/2.2) | | | buying = low: | | | | maint = vhigh: acc (4.0/2.2) | | | | maint = high: acc (4.0/1.2) | | | | maint = med: good (4.0/2.2) | | | | maint = low: good (4.0/2.2) | | lug_boot = big: | | | buying = vhigh: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: unacc (4.0/1.2) | | | | maint = med: acc (4.0/1.2) | | | | maint = low: acc (4.0/1.2) | | | buying = high: | | | | maint = vhigh: unacc (4.0/1.2) | | | | maint = high: acc (4.0/1.2) | | | | maint = med: acc (4.0/1.2) | | | | maint = low: acc (4.0/1.2) | | | buying = med: | | | | maint = vhigh: acc (4.0/1.2) | | | | maint = high: acc (4.0/1.2) | | | | maint = med: acc (4.0/1.2) | | | | maint = low: good (4.0/1.2) | | | buying = low: | | | | maint = vhigh: acc (4.0/1.2) | | | | maint = high: acc (4.0/1.2) | | | | maint = med: good (4.0/1.2) | | | | maint = low: good (4.0/1.2) safety = high: | persons = 2: unacc (192.0/1.4) | persons = 4: | | buying = vhigh: | | | maint = vhigh: unacc (12.0/1.3) | | | maint = high: unacc (12.0/1.3) | | | maint = med: acc (12.0/1.3) | | | maint = low: acc (12.0/1.3) | | buying = high: | | | maint = vhigh: unacc (12.0/1.3) | | | maint = high: acc (12.0/1.3) | | | maint = med: acc (12.0/1.3) | | | maint = low: acc (12.0/1.3) | | buying = med: | | | maint = vhigh: acc (12.0/1.3) | | | maint = high: acc (12.0/1.3) | | | maint = med: | | | | lug_boot = small: acc (4.0/1.2) | | | | lug_boot = med: acc (4.0/3.1) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = low: | | | | lug_boot = small: good (4.0/1.2) | | | | lug_boot = med: good (4.0/3.1) | | | | lug_boot = big: vgood (4.0/1.2) | | buying = low: | | | maint = vhigh: acc (12.0/1.3) | | | maint = high: | | | | lug_boot = small: acc (4.0/1.2) | | | | lug_boot = med: acc (4.0/3.1) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = med: | | | | lug_boot = small: good (4.0/1.2) | | | | lug_boot = med: good (4.0/3.1) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = low: | | | | lug_boot = small: good (4.0/1.2) | | | | lug_boot = med: good (4.0/3.1) | | | | lug_boot = big: vgood (4.0/1.2) | persons = more: | | buying = vhigh: | | | maint = vhigh: unacc (12.0/1.3) | | | maint = high: unacc (12.0/1.3) | | | maint = med: acc (12.0/2.5) | | | maint = low: acc (12.0/2.5) | | buying = high: | | | maint = vhigh: unacc (12.0/1.3) | | | maint = high: acc (12.0/2.5) | | | maint = med: acc (12.0/2.5) | | | maint = low: acc (12.0/2.5) | | buying = med: | | | maint = vhigh: acc (12.0/2.5) | | | maint = high: acc (12.0/2.5) | | | maint = med: | | | | lug_boot = small: acc (4.0/2.2) | | | | lug_boot = med: vgood (4.0/2.2) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = low: | | | | lug_boot = small: good (4.0/2.2) | | | | lug_boot = med: vgood (4.0/2.2) | | | | lug_boot = big: vgood (4.0/1.2) | | buying = low: | | | maint = vhigh: acc (12.0/2.5) | | | maint = high: | | | | lug_boot = small: acc (4.0/2.2) | | | | lug_boot = med: vgood (4.0/2.2) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = med: | | | | lug_boot = small: good (4.0/2.2) | | | | lug_boot = med: vgood (4.0/2.2) | | | | lug_boot = big: vgood (4.0/1.2) | | | maint = low: | | | | lug_boot = small: good (4.0/2.2) | | | | lug_boot = med: vgood (4.0/2.2) | | | | lug_boot = big: vgood (4.0/1.2)

比較兩者的不同，可以看到weka沒有采用Quinlan的書《C4.5:programs for machine learning》對unKnown數據的處理方式。
另外我們也可以得知，雖然《C4.5:programs for machine learning》提到的剪枝方式是EBP，但是代碼中其實使用的是PERP,weka使用的也是PERP(Pessimistirc Error Pruning)

注意，如果使用http://www.rulequest.com/Personal/c4.5r8.tar.gz中自帶的hypo數據集，那么weka就能看出比Quinlan實現的差一些。
因為Quinlan實現的版本生成的決策樹更加簡化，更加適合提取知識。

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