Experiments with ClueWeb09: Relevance Feedback and Web Tracks

In this paper, we report on our TREC experiments with the ClueWeb09 document collection. We participated in the relevance feedback and web tracks. While our phase 1 relevance feedback run’s performance was good, our other relevance feedback and web track submissions’ performances were lacking. We suspect this performance difference is caused by the Category B document subset of the ClueWeb09 collection having a higher prior probability of relevance than the rest of the collection. Future work will involve a more detailed error analysis of our experiments.