In this paper we discuss the kinds of ambiguities a heuristic encounters during the process of user session reconstruction. Some criteria are introduced to measure these ambiguities. The proposed criteria are then used to adapt a reconstructor heuristic to the conditions of a particular server log. We extend the conventional referrer-based heuristic to exploit this adaptation in order to achieve higher performance as well as a reasonable stability. The experimental results are presented and analyzed in order to show the performance achievements and the stability tradeoff.
Mehran Nadjarbashi-Noghani, Ali A. Ghorbani