我希望以以下方式对在R中运行apiriori算法产生的规则进行子集处理。
规则子集必须具有LHS,该LHS必须仅包含另一个列表(称为items)中的任何项目。对RHS没有任何限制。
我尝试了以下代码,但未能获得预期结果:
> library(arules)
> library(datasets)
> data(Groceries)
> rules <- apriori(Groceries, parameter = list(supp = 0.001, conf = 0.8))
inspect(head(rules))
lhs rhs support confidence lift
[1] {liquor,red/blush wine} => {bottled beer} 0.001931876 0.9047619 11.235269
[2] {curd,cereals} => {whole milk} 0.001016777 0.9090909 3.557863
[3] {yogurt,cereals} => {whole milk} 0.001728521 0.8095238 3.168192
[4] {butter,jam} => {whole milk} 0.001016777 0.8333333 3.261374
[5] {soups,bottled beer} => {whole milk} 0.001118454 0.9166667 3.587512
[6] {napkins,house keeping products} => {whole milk} 0.001321810 0.8125000 3.179840
items = c("curd","cereals")
rules.subset2 <- subset(rules, subset = all(lhs %in% items))
这个子集操作的结果如下(这是错误的,因为我只想在规则子集中将“酸奶和谷物”作为左手边)。
inspect(head(rules.subset2))
lhs rhs support confidence lift
[1] {liquor,red/blush wine} => {bottled beer} 0.001931876 0.9047619 11.235269
[2] {curd,cereals} => {whole milk} 0.001016777 0.9090909 3.557863
[3] {yogurt,cereals} => {whole milk} 0.001728521 0.8095238 3.168192
[4] {butter,jam} => {whole milk} 0.001016777 0.8333333 3.261374
[5] {soups,bottled beer} => {whole milk} 0.001118454 0.9166667 3.587512
[6] {napkins,house keeping products} => {whole milk} 0.001321810 0.8125000 3.179840
我尝试在这个网站上寻找答案,但没有成功。我还尝试了其他各种方法,但都没有成功。
如果您能帮忙,我将不胜感激。