How could we know the ColumnName /attribute of items generated in Rules

问题

Using arules package, 'apriori' returns a 'rules' object.

How can we make a query that - What exact column does the item(s) in rules {lhs, rhs} come from ?

Example:

I've some data in a tabular manner in file "input.csv" and want to associate/interpret the returned rule itemsets with the column headers in the file. How can I possibly do that?

Any pointers are appreciated. Thanks,

A reproducible example:
input.csv

ABC,DEF,GHI,JKL,MNO
11,56789,1,0,10
12,57685,0,0,10
11,56789,0,1,11
10,57689,1,0,12
11,56789,0,1,12
10,57685,1,0,12
10,57689,1,0,10
11,56789,0,1,12
11,56789,0,0,10
11,56789,0,0,10
11,56789,0,1,10
11,56789,0,0,10

Call to Apriori :

transactions <- read.transactions("input.csv", format="basket", sep = ',', cols = NULL,  rm.duplicates = TRUE)
Rules <- apriori(transactions, parameter = list(supp = 0.45, conf = 0.50, target = "rules"))

Returned result:

> inspect(Rules)
   lhs        rhs       support confidence     lift
1  {}      => {11}    0.6153846  0.6153846 1.000000
2  {}      => {56789} 0.6153846  0.6153846 1.000000
3  {}      => {1}     0.6153846  0.6153846 1.000000
4  {}      => {10}    0.6923077  0.6923077 1.000000
5  {}      => {0}     0.9230769  0.9230769 1.000000
6  {11}    => {56789} 0.6153846  1.0000000 1.625000
7  {56789} => {11}    0.6153846  1.0000000 1.625000
8  {11}    => {0}     0.6153846  1.0000000 1.083333
9  {0}     => {11}    0.6153846  0.6666667 1.083333
10 {56789} => {0}     0.6153846  1.0000000 1.083333
11 {0}     => {56789} 0.6153846  0.6666667 1.083333
12 {1}     => {0}     0.6153846  1.0000000 1.083333
13 {0}     => {1}     0.6153846  0.6666667 1.083333
14 {10}    => {0}     0.6923077  1.0000000 1.083333
15 {0}     => {10}    0.6923077  0.7500000 1.083333
16 {11, 56789} => {0}     0.6153846  1.0000000 1.083333
17 {0, 11}    => {56789} 0.6153846  1.0000000 1.625000
18 {0, 56789} => {11}    0.6153846  1.0000000 1.625000

Now, I want to make a distinction between the items of say, rule No.13

13 {0} => {1} 0.6153846 0.6666667 1.083333

{0} => {1} means, a value of 0 in dimension "GHI" implies a value of 1 in "JKL" or vice versa ?

so, Is there a way we can get the column name/id of the values of itemsets returned in rules object ?

回答1:

lhs = Left Hand Side, rhs = Right Hand Side

To be read as lhs => rhs.

{0} => {1} means: if the transaction contains a 0, it also has a 1 somewhere.

However, as you have not preprocessed your data appropriately, the results are meaningless. You data definitely does not look like basket input format to me.

来源：https://stackoverflow.com/questions/16399068/how-could-we-know-the-columnname-attribute-of-items-generated-in-rules

标签

data-mining

apriori

arules