Last updated on:December 9th, 2018,

Apriori Algorithm in Data Mining with examples

Apriori Algorithm in Data Mining with examples

In this tutorial, we will try to answer the following questions;

  1. What is the Apriori Algorithm?
  2. How does Apriori Algorithm work?
  3. Examples of Apriori Algorithm.

Apriori Helps in mining the frequent itemset.

Example 1:

Minimum Support: 2

apriori in data mining

Step 1: Data in the database

Step 2: Calculate the support/frequency of all items

Step 3: Discard the items with minimum support less than 2

Step 4: Combine two items

Step 5: Calculate the support/frequency of all items

Step 6: Discard the items with minimum support less than 2

Step 6.5: Combine three items and calculate their support.

Step 7: Discard the items with minimum support less than 2

Result:

Only one itemset is frequent (Eggs, Tea, Cold Drink) because this itemset has minimum support 2 


Example 2:

Minimum Support :3

how to find frequent itemset

Step 1: Data in the database

Step 2: Calculate the support/frequency of all items

Step 3: Discard the items with minimum support less than 3

Step 4: Combine two items

Step 5: Calculate the support/frequency of all items

Step 6: Discard the items with minimum support less than 3

Step 6.5: Combine three items and calculate their support.

Step 7: Discard the items with minimum support less than 3

Result:

There is no frequent itemset because all itemsets have minimum support less than 3

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