com.planetj.taste.correlation
Interface ItemCorrelation

All Superinterfaces:

Refreshable

All Known Implementing Classes:

GenericItemCorrelation, PearsonCorrelation

public interface ItemCorrelation
extends Refreshable

Implementations of this interface define a notion of itemCorrelation between two Items. Implementations should return values in the range -1.0 to 1.0, with 1.0 representing perfect correlation.

Author:

Sean Owen

See Also:

UserCorrelation

Method Summary

double

itemCorrelation(Item item1, Item item2) Returns the "itemCorrelation", or degree of similarity, of two Items, based on the preferences that Users have expressed for the items.

Methods inherited from interface com.planetj.taste.common.Refreshable

refresh

Method Detail

itemCorrelation

double itemCorrelation(Item item1,
                       Item item2)
                       throws TasteException

Returns the "itemCorrelation", or degree of similarity, of two Items, based on the preferences that Users have expressed for the items.

Parameters:

item1 - first item

item2 - second item

Returns:

itemCorrelation between the Items

Throws:

TasteException - if an error occurs while accessing the data