Guess Again and See if They Line up: Surrey's Runs at Plagiarism Detection Notebook for PAN at CLEF 2013

This paper briefly describes the approaches taken to the two subtasks of Source Retrieval and Text Alignment, in the Plagiarism Detection track at PAN 13. For the first of these, we reuse our PAN12 approach – which combines frequency and a contrastive corpus measure to select keywords for querying the ChatNoir search system; for the second, we reuse software that had previously featured in PAN11 and PAN12. We comment on how effective both approaches were, and what steps should be taken if the competition remains substantially similar next time.