A method for associating a web session with a particular member of a group of users includes: receiving a plurality of training web sessions, each training web session including one or more web events generated by a respective known user having one or more demographic attributes; training one or more binary classifiers using the training web sessions and the demographic attributes of the users; receiving a plurality of target web sessions, each target web session including one or more web events that are generated by a respective unknown member of a group of users, wherein each user has one or more demographic attributes; and applying one or more of the binary classifiers to the target web sessions such that a respective target web session is uniquely associated with a member based on, at least in part, the demographic attributes of the member.