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Measuring Search Engine Quality 总被引:12,自引:3,他引:9
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures. 相似文献
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Lyn Yates Larissa McLean Davies Lucy Buzacott Brenton Doecke Philip Mead Wayne Sawyer 《Curriculum Journal》2019,30(1):51-68
This article takes up questions about knowledge and the school curriculum with respect to literary studies within subject English. Its intention is to focus on literary studies in English from the context of current waves of curriculum reform, rather than as part of the conversations primarily within the field of English, to raise questions about the knowledge agenda, and the knowledge-base agenda for teaching and teacher education. The selection of texts and form of study of literature within the English curriculum has long been an area of controversy. Without assuming a particular position on knowledge in this area, this article shows that important questions of what knowledge-base teachers are expected to bring to their work are elided both in current regulations and debates, and in research on ‘good teaching’ in this area. If ‘literary studies’ (as a discipline or university major) is itself an unstable and changing field, what kind of knowledge does a good English teacher bring to their work? This paper takes up these questions in the context of the Australian Curriculum and standards for teacher registration, but it also points to the way these issues about knowledge are of broader relevance for researchers and teacher education. 相似文献
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Phillip D. Bailey Anthony J. Onwuegbuzie 《Assessment & Evaluation in Higher Education》2002,27(5):463-473
The purpose of this study was to determine which study habits distinguish successful from unsuccessful foreign language learners. Participants were 219 college students from a variety of disciplinary backgrounds, enrolled in either Spanish, French, German or Japanese classes. A canonical discriminant analysis (F [6, 117], p < 0.0001; canonical R = 0.92) revealed that, compared to their high-performing counterparts, students with the lowest levels of foreign language performance tended to report that: (a) they frequently include a lot of irrelevant or unimportant information in their notes; (b) when they have difficulty with their assignments, they do not seek help from their instructor; (c) they put their lecture notes away after taking the test and never consult them again; (d) they have to be in the mood before attempting to study; (e) they have a tendency to doodle or to daydream when they are trying to study; and (f) they do not look up in a dictionary the meanings of words that they do not understand. Implications are discussed. 相似文献
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Students as partners (SaP) has seen an increase in focus as an area of active student engagement in higher education. Many complexities and challenges have been shared in this evolving field regarding inclusivity and power. We discuss, in this dialogue, insights that can be uncovered by exploring SaP through a feminist lens – illuminating the fact that both fields seem to be seated in similar radical processes of challenging, questioning, destabilising, deconstructing, and empowering. We unravel issues of power and exclusion by exploring: what feminist theories might add to SaP; embedded binaries and what they reveal about power relations within the language of SaP; and ways of writing about SaP that are inclusive. We aim to step away from dominant understandings, incite acts of self-reflection, and open possibilities for future research and practice by questioning the boundaries and binaries that currently shape the institutions of higher education. 相似文献
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Alazne Aizpitarte Olivia E. Atherton Lucy R. Zheng Itziar Alonso-Arbiol Richard W. Robins 《Child development》2019,90(1):117-126
Relational aggression—a psychological form of aggression—has numerous negative consequences for physical and emotional health. However, little is known about the risk factors that lead youth to engage in relational aggression. Using multimethod data from a longitudinal research of 674 Mexican-origin youth, this study examined the influence of parents, siblings, and peers on the development of relational aggression. Increases in relational aggression from age 10 to 16 were associated with: (a) low levels of parental monitoring and (b) increased association with deviant peers and siblings. These results held across gender and nativity status. The findings suggest that multiple socialization agents contribute to the development of relational aggression. We discuss the practical implications for reducing relational aggression during adolescence. 相似文献