Apriori-Algorithm

Algorithm Steps:

• Generate frequent 1-itemsets
• Repeat until no itemsets can be generated:
• Generate candidate itemsets.
  
• Candidate Pruning.
• Calculate support.
• Support pruning.

• Generate strong rules:
• Start with frequent 2-itemsets.
• Generate combinations of rules.
• Keep strong rules.

NOTE: If you have Transaction Data like:
[TID - Itemset]
1 - Tomato,Pepsi,Bread
2 - Pepsi,Bread
3 - Bread,Eggs
4 - Milk,Bread
5 - Milk,Eggs,Tomato

Then you should enter it in left Grid as:
[TID - Itemset]
1 - T,P,B
2 - P,B
3 - B,E
4 - M,B
5 - M,E,T