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Stephen Robertson
Researcher at Microsoft
Publications - 199
Citations - 24850
Stephen Robertson is an academic researcher from Microsoft. The author has contributed to research in topics: Relevance (information retrieval) & Ranking (information retrieval). The author has an hindex of 61, co-authored 197 publications receiving 23363 citations. Previous affiliations of Stephen Robertson include Universities UK & City University London.
Papers
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Proceedings Article
Okapi at TREC
TL;DR: Much of the work involved investigating plausible methods of applying Okapi-style weighting to phrases, and expansion using terms from the top documents retrieved by a pilot search on topic terms was used.
Book
Relevance weighting of search terms
TL;DR: This paper examines statistical techniques for exploiting relevance information to weight search terms using information about the distribution of index terms in documents in general and shows that specific weighted search methods are implied by a general probabilistic theory of retrieval.
Book
The Probabilistic Relevance Framework
Stephen Robertson,Hugo Zaragoza +1 more
TL;DR: This work presents the PRF from a conceptual point of view, describing the probabilistic modelling assumptions behind the framework and the different ranking algorithms that result from its application: the binary independence model, relevance feedback models, BM25 and BM25F.
Journal ArticleDOI
Relevance weighting of search terms
TL;DR: In this article, a series of relevance weighting functions is derived and is justified by theoretical considerations, in particular, it is shown that specific weighted search methods are implied by a general probabilistic theory of retrieval.
Journal ArticleDOI
Understanding inverse document frequency: on theoretical arguments for IDF
TL;DR: It is shown that the Information Theory approaches are problematic, but that there are good theoretical justifications of both IDF and TF*IDF in the traditional probabilistic model of information retrieval.