Table 4.

ROUGE-2, ROUGE-L and BLEU inter-annotator agreement for each summary type.

Summarization type	ROUGE-2	ROUGE-L	BLEU
Multi-document, abstractive	0.19	0.32	0.17
Multi-document, extractive	0.56	0.57	0.49
Single document, abstractive	0.28	0.42	0.19
Single document Extractive	0.82	0.83	0.74