By Carol Peters (auth.), Carol Peters, Fredric C. Gey, Julio Gonzalo, Henning Müller, Gareth J. F. Jones, Michael Kluck, Bernardo Magnini, Maarten de Rijke (eds.)
The 6th crusade of the pass Language assessment discussion board (CLEF) for eu languages was once held from January to September 2005. CLEF is by way of now a longtime overseas assessment initiative and seventy four teams from world wide submitted effects for a number of of different assessment tracks in 2005, in comparison with fifty four teams in 2004. there have been 8 distinctive overview tracks, designed to check the functionality of quite a lot of structures for multilingual details entry. complete info in regards to the layout of the tracks, the methodologies used for assessment, and the implications got by way of the individuals are available within the varied sections of those court cases. As constantly the result of the crusade have been pronounced and mentioned on the annual workshop held in Vienna, Austria, September 21-23, instantly following the 9th ecu convention on electronic Libraries. The workshop used to be attended through nearly a hundred and ten educational and commercial researchers and process builders. as well as shows by means of individuals within the crusade, Noriko Kando from the nationwide Institute of Informatics, Tokyo, gave an invited speak at the actions of the NTCIR assessment initiative for Asian languages. Breakout classes gave contributors an opportunity to debate rules and ends up in aspect. the ultimate consultation used to be devoted to proposals for actions for CLEF 2006. The displays given on the workshop are available at the CLEF site at: www. clef-campaign. org. we must always prefer to thank the opposite individuals of the CLEF steerage Committee for his or her counsel within the coordination of this event.
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Extra info for Accessing Multilingual Information Repositories: 6th Workshop of the Cross-Language Evalution Forum, CLEF 2005, Vienna, Austria, 21-23 September, 2005, Revised Selected Papers
232 Table 3. Boost values for n-gram-based retrieval experiments # of terms in phrase 1 2 3 4 Boosts according to origin Origin: title Origin: description 3, if short: 10 1, if short: 8 4 2 5 2 5 2 The single most important issue though are short terms. Phrase queries with only one term are of course just plain term queries. If, however, such a term query contains a term that has a smaller word length than the gram size, and taking into account that stopwords are eliminated, there is strong evidence that that term is highly important.
On the other hand, for the Merging task the performance improvement of the top participant with respect to 2003 is less than in the case of the 2-Years-On task. There is also less variation between the submissions for the Merging task than seen in the earlier 2003 runs. This is probably due to the fact that the participants were using the same ranked lists, and that the variation in performance arises only from the merging strategies adopted. Figure 10 compares the performances in terms of the precision at diﬀerent document cut-oﬀ values of the top participants of the 2-Years-On task with respect to the top and the ﬁfth performer of CLEF 2003 Multilingual-8.
Prec. 346 Table 9. Best runs of stemmer-based retrieval experiments Stemmer Egothor Egothor Lucene Snowball Run Type brf 5 10, boost 9 3 3 brf 5 60, boost 9 3 1 brf 5 30, boost 9 3 1 brf 5 30, boost 9 3 1 Recall, max = 915 855 843 863 856 Avg. Prec. 400 Queries that contained terms from both title and description fields from the topic files performed better than those that were based on only one source. The weighting of these terms, however, was a major impact factor. Several experiments with different boost values and blind relevance feedback parameters were carried out for each stemmer.
Accessing Multilingual Information Repositories: 6th Workshop of the Cross-Language Evalution Forum, CLEF 2005, Vienna, Austria, 21-23 September, 2005, Revised Selected Papers by Carol Peters (auth.), Carol Peters, Fredric C. Gey, Julio Gonzalo, Henning Müller, Gareth J. F. Jones, Michael Kluck, Bernardo Magnini, Maarten de Rijke (eds.)