imsl.data_mining.frequent_itemsets¶

frequent_itemsets(max_num_products, x, max_set_size=5, min_pct_support=0.1)¶

Compute the frequent itemsets in a transaction set using Apriori.

Parameters:

Parameters:	max_num_products : int The maximum number of unique items or products that may be present in the transactions. x : (n, 2) array_like An array containing the transaction data. The first column of x contains the transaction IDs, and the second column contains the item IDs. Each row represents a transaction ID and item ID pair. The algorithm assumes that an individual transaction is complete within a single data set. That is, there is no matching of transaction IDs between different data sets. max_set_size : int, optional The maximum size of an itemset. Only frequent itemsets with max_set_size or fewer items are considered in the analysis. min_pct_support : float, optional The minimum percentage of transactions in which an item or itemset must be present to be considered frequent. min_pct_support must be in the interval [0,1].
Returns:	FrequentItemSets An object of type `FrequentItemSets` containing the frequent itemsets.

max_num_products : int

The maximum number of unique items or products that may be present in the transactions.

x : (n, 2) array_like

An array containing the transaction data. The first column of x contains the transaction IDs, and the second column contains the item IDs. Each row represents a transaction ID and item ID pair. The algorithm assumes that an individual transaction is complete within a single data set. That is, there is no matching of transaction IDs between different data sets.

max_set_size : int, optional

The maximum size of an itemset. Only frequent itemsets with max_set_size or fewer items are considered in the analysis.

min_pct_support : float, optional

The minimum percentage of transactions in which an item or itemset must be present to be considered frequent. min_pct_support must be in the interval [0,1].

Returns:

FrequentItemSets

An object of type FrequentItemSets containing the frequent itemsets.