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| Content Provider | ACM Digital Library |
|---|---|
| Author | Raifer, Nimrod Tennenholtz, Moshe Kurland, Oren Raiber, Fiana |
| Abstract | In competitive search settings as the Web, there is an ongoing ranking competition between document authors (publishers) for certain queries. The goal is to have documents highly ranked, and the means is document manipulation applied in response to rankings. Existing retrieval models, and their theoretical underpinnings (e.g., the probability ranking principle), do not account for post-ranking corpus dynamics driven by this strategic behavior of publishers. However, the dynamics has major effect on retrieval effectiveness since it affects content availability in the corpus. Furthermore, while manipulation strategies observed over the Web were reported in past literature, they were not analyzed as ongoing, and changing, post-ranking response strategies, nor were they connected to the foundations of classical ad hoc retrieval models (e.g., content-based document-query surface level similarities and document relevance priors). We present a novel theoretical and empirical analysis of the strategic behavior of publishers using these foundations. Empirical analysis of controlled ranking competitions that we organized reveals a key strategy of publishers: making their documents (gradually) become similar to documents ranked the highest in previous rankings. Our theoretical analysis of the ranking competition as a repeated game, and its minmax regret equilibrium, yields a result that supports the merits of this publishing strategy. We further show that it can be predicted with high accuracy, and without explicit knowledge of the ranking function, whether documents will be promoted to the highest rank in our competitions. The prediction utilizes very few features which quantify changes of documents, specifically with respect to those previously ranked the highest. |
| Starting Page | 465 |
| Ending Page | 474 |
| Page Count | 10 |
| File Format | |
| ISBN | 9781450350228 |
| DOI | 10.1145/3077136.3080785 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2017-08-07 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Ad hoc retrieval Ranking competition Game theory |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
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