... F-scores for different systemspacts in measuring the similarity between the sen-tences in the random walk framework for answer-ing complex questions. Our experiments suggest thefollowing: (a) similarity ... 776–783, Prague,Czech Republic. ACL.J. Otterbacher, G. Erkan, and D. R. Radev. 2005. Us-ing Random Walks for Question-focused Sentence Re-trieval. In Proceedings of Human Language Technol-ogy Conference ... more effective way than the traditional TF*IDFbased similarity measures.2 Graph-based Random Walk Model forText SummarizationIn (Erkan and Radev, 2004), the concept of graph-based centrality...