A Survey of Various Summary Evaluation Techniques

Evaluation of text summary is very essential issue of summarization. Normally, we can judge the relevance of any summary by applying extrinsic or intrinsic evaluation measures. Intrinsic evaluation techniques try to judge the relevance of any summary with evaluation by human experts. Extrinsic evaluation techniques judge quality of summary with task oriented techniques like task related to extraction of information. Usually we should must judge two attributes of any summary i) Compression Ratio (C.R.) which states up to which extent the summary is to be compressed as compared to source text and ii) Retention Ratio (RR) which states up to which extent we have to retain the information in the summary. RR is ratio of information present in summary to the information present in source text. At many places RR is also termed as omission ratio. This paper describes survey of different summary evaluation techniques including intrinsic & extrinsic evaluation techniques. Keywords— Summary evaluation, intrinsic evaluation, extrinsic evaluation