Apriori算法参数含义
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使用了weka安装目录data文件夹下的contact-lenses.arff数据
实验结果及分析
1. 以其中一组实验为例做详细分析
具体参数设置如下图:
结合实验结果阐释下列12个参数的含义
1.
2.
3.
4.
5.
在
a)
b)
Leverage=0时A和B独立,Leverage越大A和B的关系越密切
c)
6.
7.
8.
9.
10.
11.
12.
完整的实验结果输出及具体分析
=== Run information ===
Scheme:
Relation:
Instances:
Attributes:
=== Associator model (full training set) ===
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Apriori
=======
Minimum support: 0.5 (12 instances)
Minimum metric <confidence>: 0.9
Number of cycles performed: 10
Generated sets of large itemsets:
Size of set of large itemsets L(1): 7
Large Itemsets L(1):
spectacle-prescrip=myope 12
spectacle-prescrip=hypermetrope 12
astigmatism=no 12
astigmatism=yes 12
tear-prod-rate=reduced 12
tear-prod-rate=normal 12
contact-lenses=none 15
%%%%%%%%%%%%%%%%%%%%%%%%
在上面所示数据界面中,分别点击标签spectacle-prescrip,astigmatism,tear-prod-rate和contact-lenses,该列的值会自动进行分类排序,可以很方便的对上面结果进行。点击age标签,其值按pre-presbiopic、presbiopic和young分类排序,可以看到各属性值的记录数均为8<12,不满足最小支持度,因此age属性的所有取值都没有列在上面结果中。
%%%%%%%%%%%%%%%%%%%%%%%%
Size of set of large itemsets L(2): 1
Large Itemsets L(2):
tear-prod-rate=reduced contact-lenses=none 12
//tear-prod-rate取值为reduced且
Best rules found:
//
2.其它实验设置及部分结果展示
1.
2.
1. tear-prod-rate=reduced 12 ==> contact-lenses=none 12
3.
1. tear-prod-rate=reduced 12 ==> spectacle-prescrip=myope contact-lenses=none 6
4.
1. tear-prod-rate=reduced 12 ==> contact-lenses=none 12
2. contact-lenses=none 15 ==> tear-prod-rate=reduced 12
3. tear-prod-rate=reduced 12 ==> spectacle-prescrip=myope contact-lenses=none 6
5.
1. tear-prod-rate=reduced 12 ==> contact-lenses=none 12
2. spectacle-prescrip=myope tear-prod-rate=reduced 6 ==> contact-lenses=none 6
3. spectacle-prescrip=hypermetrope tear-prod-rate=reduced 6 ==> contact-lenses=none 6
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