[问答] 做关联分析时结果的空串是什么意思 [推广有奖]

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thisnoon 发表于 2018-5-2 11:21:30 |AI写论文

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用apriori函数做关联分析，rules <- apriori(data, parameter= list(support=0.4, confidence=0.8,maxlen=3))
inspect()输出排序后的结果有很多空串，我看了原文件没有空串，请问产生空串是因为参数设置有问题吗？##############################################################
输出结果如下
##############################################################

"","rules","support","confidence","lift","count"
"56","{} => {pedc.pedczcw.为主.25}",0.987159312645559,0.987159312645559,1,31366
"55","{} => {pedc.pedczcw.为从.25}",0.987064895826777,0.987064895826777,1,31363
"53","{} => {pedc.pedczcw.为主.29}",0.986750173097501,0.986750173097501,1,31353
"3255","{pedc.pedczcw.为从.25} => {pedc.pedczcw.为主.25}",0.986718700824574,0.999649268246022,1.01265242138778,31352
"3256","{pedc.pedczcw.为主.25} => {pedc.pedczcw.为从.25}",0.986718700824574,0.999553656825862,1.01265242138778,31352
"54","{} => {pedc.pedczcw.为从.29}",0.986718700824574,0.986718700824574,1,31352

"3253","{pedc.pedczcw.为从.29} => {pedc.pedczcw.为主.25}",0.986498394914081,0.999776728757336,1.01278153986914,31345
"3254","{pedc.pedczcw.为主.25} => {pedc.pedczcw.为从.29}",0.986498394914081,0.999330485238794,1.01278153986914,31345
"3246","{pedc.pedczcw.为从.29} => {pedc.pedczcw.为主.29}",0.986466922641153,0.999744832865527,1.01316914870887,31344
"3245","{pedc.pedczcw.为主.29} => {pedc.pedczcw.为从.29}",0.986466922641153,0.999712946129557,1.01316914870887,31344

##############################################################
原始数据大概是这种，没有空串
##############################################################
ID,event_info
1,DT_XBT201.kgkz.打开.9
1,DT_XBT404.kgkz.打开.9
1,PSCADA.g1.rtu1.投入.9
1,pedc.pedczcw.为主.9
1,FAS.g2.rtu2.chan1.投入.9
1,FAS.g2.rtu2.投入.9
1,PSD.g1.rtu1.chan1.投入.9
1,PSD.g1.rtu1.chan2.投入.9
1,PSD.g1.rtu1.投入.9
1,PA.g1.rtu1.chan1.投入.9
1,PA.g1.rtu1.投入.9
1,BAS.g1.rtu1.chan1.投入.9
1,FAS.g1.rtu1.chan1.投入.9
1,pedc.pedczcw.为从.9
1,BB22_NOM1.zcgz.正常.9
1,SF_XB4.fjqdtzkz.运行.9
1,BB21_NOM1.zcgz.故障.9
1,pedc.pedczcw.为主.9
1,PA.g1.rtu1.chan1.退出.9
1,PA.g1.rtu1.退出.9
2,pedc.pedczcw.为从.9
2,PA.g1.rtu1.chan1.投入.9
2,PA.g1.rtu1.投入.9
2,BB11_NOM1.zcgz.正常.9
2,BB22_NOM1.zcgz.故障.9
2,pedc.pedczcw.为主.9
2,pedc.pedczcw.为从.9
3,PA.g1.rtu1.chan1.退出.9
3,PA.g1.rtu1.退出.9
3,pedc.pedczcw.为主.9
3,PA.g1.rtu1.chan1.投入.9
3,PA.g1.rtu1.投入.9
3,EF_XB4.msztyzbyz.不一致.9
3,BB11_NOM1.zcgz.故障.9
3,tfxxtXB4ms.zxzt.停止.9
3,tfxxtXB4ms.zxzt.失败.9
3,pedc.pedczcw.为从.9
3,DT_XBT402.mszt.不一致.9
3,tfxxtXB6ms.zxzt.停止.9
3,tfxxtXB6ms.zxzt.失败.9
3,tfxxtXB6ms.zxzt.启动中.9
3,pedc.pedczcw.为主.9
4,BB11_NOM1.zcgz.正常.9
4,tfxxtXB6ms.zxzt.失败.9
4,BB21_NOM1.zcgz.正常.9
4,pedc.pedczcw.为从.9
4,pedc.pedczcw.为主.9
4,PA.g1.rtu1.chan1.退出.9
4,PA.g1.rtu1.退出.9
4,BB21_NOM1.zcgz.故障.9
4,BB11_NOM1.zcgz.故障.9
4,BB21_NOM1.zcgz.正常.9
4,BB22_NOM1.zcgz.正常.9
4,PA.g1.rtu1.chan1.投入.9
4,PA.g1.rtu1.投入.9
4,pedc.pedczcw.为从.9
5,pedc.pedczcw.为主.9
5,PA.g1.rtu1.chan1.退出.9
5,PA.g1.rtu1.退出.9
5,BB11_NOM1.zcgz.正常.9
5,BB22_NOM1.zcgz.故障.9
5,pedc.pedczcw.为从.9
5,pedc.pedczcw.为主.9
6,pedc.pedczcw.为从.9
6,BB11_NOM1.zcgz.故障.9
6,BB21_NOM1.zcgz.故障.9
6,PA.g1.rtu1.chan1.投入.9
6,PA.g1.rtu1.投入.9
6,pedc.pedczcw.为主.9