Difficulty understanding the example provided in the spmf documentation
Posted by:
suranga
Date: March 02, 2013 09:23PM
Hi everyone,
I'm trying out the IGB Basis of association rules, and being a novice to association mining, I'm having some difficulty understanding the example provided here -
http://www.philippe-fournier-viger.com/spmf/index.php?link=documentation.php#example7
If you look at the results table provided for that example, you'll see that it looks like,
1 ==> 2, 4, 5 0.50 0.75
4 ==> 1, 2, 5 0.50 0.75
3 ==> 2, 5 0.50 0.75
{} ==> 2, 3 0.66 0.66
{} ==> 1, 2, 5 0.66 0.66
{} ==> 2, 4 0.66 0.66
{} ==> 2, 5 0.83 0.83
{} ==> 2 1 1
My question is, what does the empty curled braces imply in the above results table ? I can understand what the 1 ==> 2,4,5 etc. implies, but am baffled over the empty braces issue.