Data mining system capable of generating pairwise comparisons of user-selectable items based on user event histories

A computer-implemented method of performing a pairwise comparison between a first item and a second item represented in an electronic data repository, the method comprising:

• accessing session data stored in computer storage, said session data reflective of item consideration actions and item selection actions of each of a plurality of users, said item consideration actions and item selection actions corresponding to particular items represented in the electronic data repository;
• based on the session data, identifying a set of sessions in which both (1) the first item and the second item were both considered, and (2) exactly one of the first item and the second item was selected, said set of sessions comprising a plurality of sessions of a plurality of users;
• generating, by a computer system, pairwise comparison data based on the identified set of sessions, said pairwise comparison data indicating, at least approximately, a degree to which users who have considered both the first item and the second item have selected the second item over the first item;
• and
• causing the pairwise comparison data to be presented to users of the electronic data repository in association with the first and second items.

A computer system, including one or more physical computers coupled to computer storage, said one or more physical computers being programmed to perform the method of:

• accessing session data stored in computer storage, said session data reflective of item consideration actions and item selection actions of each of a plurality of users, said item consideration actions and item selection actions corresponding to particular items represented in the electronic data repository;
• based on the session data, identifying a set of sessions in which both (1) the first item and the second item were both considered, and (2) exactly one of the first item and the second item was selected, said set of sessions comprising a plurality of sessions of a plurality of users;
• generating pairwise comparison data based on the identified set of sessions, said pairwise comparison data indicating, at least approximately, a degree to which users who have considered both the first item and the second item have selected the second item over the first item;
• and
• causing the pairwise comparison data to be presented to users of the electronic data repository in association with the first and second items.