Generating an Overview Report over Many Documents
Table 2: Information-coverage scores
['[EMPTY]', '[ITALIC] λ [BOLD] =0.1', '[ITALIC] λ [BOLD] =0.2', '[ITALIC] λ [BOLD] =0.3']
Let A be a set of top k words from the original corpus and B a set of top k words from a generated report. Let Sk(A,B)=|A∩B|/k denote the information coverage score of A and B. Then Sk(A,B)≤1 with Sk(A,B)=1 being the best possible score. We can see that the report generated on 0.2-summaries achieves the highest information coverage score over BBC News, and the report generated on 0.1-summaries or 0.3-summaries achieves the highest information coverage score over Factiva-Marx.