数据库和分类规则,如何计算precision和recall?
MinSupp=3% và MinConf=30%
No. outlook temperature humidity windy play
1 sunny hot high FALSE no
2 sunny hot high TRUE no
3 overcast hot high FALSE yes
4 rainy mild high FALSE yes
5 rainy cool normal FALSE yes
6 rainy cool normal TRUE no
7 overcast cool normal TRUE yes
8 sunny mild high FALSE no
9 sunny cool normal FALSE yes
10 rainy mild normal FALSE yes
11 sunny mild normal TRUE yes
12 overcast mild high TRUE yes
13 overcast hot normal FALSE yes
14 rainy mild high TRUE no
发现规则:
1:(前景,阴)->(玩,是)[支持=0.29,信心=1.00,正确分类=3、7、12、13]
2:(湿度,正常),(有风,FALSE)->(播放,是)[支持=0.29,置信度=1.00,正确分类=5、9、10]
3:(前景,晴天),(湿度,高)->(播放,否)[支持=0.21,置信度=1.00,正确分类=1、2、8]
4: (outlook,rainy), (windy,FALSE) -> (play,yes) [Support=0.21 , Confidence=1.00 , Correctly Classify= 4]
5:(前景,晴天),(湿度,正常)->(播放,是)[支持=0.14,置信度=1.00,正确分类=11]
6: (outlook,rainy), (windy,TRUE) -> (play,no) [Support=0.14 , Confidence=1.00 , Correctly Classify= 6, 14]
谢谢。