an extensive empirical study of feature selection metrics for text

... and com- pute an association score for each collocation candi- date extracted from a corpus. The scores indicate a chance of a candidate to be a collocation. They can be used for ranking or for ... N b) C w empirical context of w C xy empirical context of xy C l xy left immediate context of xy C r xy right immediate context of xy Table 1: a) A contingency table with observed frequencies and marginal ... andsemanticunit. For each bigram occurring in the corpus, information of its empiricalcontext (frequencies of open-class words occurring within a specified context window) and left and right im- mediate contexts...

Ngày tải lên: 08/03/2014, 04:22

... classification for online product reviews. In Proceedings of AAAI-06, the 21st National Conference on Artificial Intelligence. G. Forman. 2003. An extensive empirical study of feature selection metrics ... Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 692–700, Suntec, Singapore, 2-7 August 2009. c 2009 ACL and AFNLP A Framework of Feature Selection Methods for Text ... methods, MI and BNS take the leads in the domains of 20NG and Movie while IG and CHI seem to be better and more stable than others in the domain of DVD. As for WFO, its performances are excellent...

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Ngày tải lên: 09/09/2013, 23:50

... looking for information concerning the history of text compression both before and with computers. 1 http://answers.google.com b) Provide an analysis on the future of web browsers, if any. Answers ... creation of an Information Synthesis testbed with 72 reports manually generated by nine subjects for eight com- plex topics with 100 relevant documents each; and b) an empirical comparison of similarity ... Pro- cessing Conference and the 1st Conference of the North American Chapter of the Association for Computational Linguistics, Seattle, WA, April. An Empirical Study of Information Synthesis Tasks Enrique...

Ngày tải lên: 20/02/2014, 15:20

... of them. The features are listed as follows: ã WORD: uni-gram and bi-grams of words in an n window. ã POS: uni-gram and bi-grams of POS in an n window. ã WORD+POS: Both the features of WORD and ... Association for Computational Linguistics An Empirical Study of Chinese Chunking Wenliang Chen, Yujie Zhang, Hitoshi Isahara Computational Linguistics Group National Institute of Information and Communications ... we conducted an empirical study of Chinese chunking. We compared the performance of four models, SVMs, CRFs, MBL, and TBL. We also investigated the effects of using different sizes of training...

Ngày tải lên: 08/03/2014, 02:21

... autonomous exploration of the set of alternatives and the selection of the preferred alternatives. Let’s examine now how an argument generator can be evaluated in the context of the selection task, ... assistants 1 . For instance, a shopping assistant may need to compare two similar products and argue why its current user should like one more than the other. 1 See for instance www.activebuyersguide.com ... deviation units of a measure x i from the mean of a population X. Formally: x i ∈ X; z-score( x i ,X) = [x i - à (X)] / (X) For instance, the satisfaction z-score for the new instance, given...

Ngày tải lên: 08/03/2014, 05:20

Ngày tải lên: 16/03/2014, 03:20

... survey/sdata/200701/ certca.html. [6] S. Egelman, L. F. Cranor, and J. Hong. You’ve been warned: an empirical study of the effectiveness of web browser phishing warnings. In Proceeding of the SIGCHI Conference on Human Factors ... page of the warning. Fif- teen participants answered exactly as expected – they selected “other” for the library and “bank or other financial institution” for the bank. The remaining five participants ... bank wanted you to take?” responded that it wanted them not to pro- ceed. Only 3 FF2, 2 FF3, and 4 IE7 participants answered the same way. 4.2.4 Impact of Reading and Understanding In each of...

Ngày tải lên: 16/03/2014, 19:20

... An Empirical Study of Active Learning with Support Vector Machines for Japanese Word Segmentation Manabu Sassano Fujitsu Laboratories Ltd. 4-1-1, Kamikodanaka, Nakahara-ku, Kawasaki ... mixed hiragana, kanji and katakana. The second attribute is a character code ( ). The range of a character code is from 1 to 6,879. JIS X 0208, which is one of Japanese character set stan- dards, ... word boundary. A set of the attributes of , and is used to predict the label of the . The set consists of twenty attributes: ten for the char- acter type ( , , , , , , , , , ), and an- other ten for the character...

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Ngày tải lên: 15/04/2015, 16:29

... con- sistent pattern of the effect of smoking on risk of can- cer deaths. TABLE 1. Characteristics of cases and two control groups: Population-based case-control study of smoking on risk of cancer deaths ... (1.84–2.08) and 1.88 (1.79–1.97) for esophagus cancer; 1.29 (1.23–1.35) and 1.28 (1.24–1.34) for stomach cancer; 1.35 (1.31–1.39) and 1.33 (1.27–1.39) for liver cancer, 2.98 (2.88–3.08) and 2.95 ... of death at one time, and use of a single control group for more than one case series can lead to saving of money and time; 11-12 (3) all possible confounding factors (known or unknown) and...

Ngày tải lên: 26/10/2012, 09:48

... to some semantic subset of an antecedent. There was one additional case in which a subsequent noun phrase was a rephrasing of an antecedent. For the remaining 71 instances, no antecedent could ... participant. Partici- pants of the study were each asked to plan a spe- cific travel agenda of their choice with information obtained solely by typing natural language mes- sages and requests ... infrequently and since one of the major foci of the study was to try to find general means of deciding attachment of PPs, individualization of these PPs was, at first, discounted. In some of the...

Ngày tải lên: 08/03/2014, 18:20

... sug- gesting that management accounting systems are changed because of fads and fashions. However, fad and fashion as explanations for diusion of management accounting innovation and change are not ... inside the group of adopting organizations. 5.1.2. The analysis of organizati onal determinants Let us next focus on the organizational deter- minants of adopting organizations instead of the adopter ... Adoption and diusion of an innovation of uncertain prođtability. Jour nal of Economic Theory, 27, 182±193. Johnson, H. T., & Kaplan, R. S. (1987). Relevance lost: the rise and fall of management...

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