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Topic: Precision and Recall

    Note: these results are not from the primary (high quality) database.

Spam Filtering II Precision and recall are the standard metrics used in information literature, whereas miss rate and false positive rate are often used in reporting spam filtering results. Precision and Recall are used in the table and are defined as follows. False positives are especially important when selecting a mail filter to use, having to read the spam folder to find the false positives almost defeats the purpose of using a filter. sam.holden.id.au /writings/spam2   (4349 words)

Dell recalls laptop power supplies InfoWorld News 2004-10-08 By Peter Sayer, IDG News Service Dell (Profile, Products, Articles) Inc. is recalling some of the one million electrical adapters manufactured in China by Delta Electronics Inc. of Taipei and sold for use with Dell notebook computers, following seven reports of the adapters overheating. They were sold between September 1998 and February 2002 for use with some of Dell's Latitude, Precision and Inspiron notebooks, and are marked with the name "Dell" and the part numbers "P/N 9364U," P/N 7832D" or "P/N 4983D," according to the CPSC. Not all such adapters are being recalled, according to the Dell: owners should contact the company to find out whether their adapter is affected. www.infoworld.com /article/04/10/08/HNdellrecalls_1.html   (4349 words)

Precision and Recall of Five Search Engines for Retrieval of Scholarly Information in the Field of Biotechnology The mean values for precision and relative recall is obtained by micro-averaging (Clarke & Willet, 1997; Tague, 1992) i.e. The mean precision and recall of the observations in AltaVista show a slight increase while as HotBot shows marginal increase in precision but decrease in its recall value (Table 2). Bar-Ilan, J. On the overlap, the precision and estimated recall of search engines: A case study of the query "Erdos". www.webology.ir /2005/v2n2/a12.html   (2175 words)

Re: Loss of decimal precision values [Tue, 28 Sep 2004] I recall Mike's explanation for this, which I cannot find in the archives right now, so I'll just mention what I believe was the main reason to keep it as an option. Re: Loss of decimal precision values [Tue, 28 Sep 2004] For anybody who might be interested, we are in the early stages of developing a new website and this is a sample page: A visit to Hyner, Pennsylvania (PA) www.teradataforum.com /teradata/20040928_154940.htm   (134 words)

AEintro.htm Salient performance parameters studied include recall, precision, and false alarms.             Precision:        # of articles ArticleExtractor selects that are also selected by db_to_text It should be noted that db_to_text post-processes the set of articles extracted using rule-based methods. home.cfl.rr.com /lleftin/AEintro.htm   (317 words)

Methodological Issues in Measuring Alcohol Use Third, a short recall period generally is inadequate for simultaneously assessing alcohol–related problems, many of which occur rarely and can be measured with sufficient precision only over a period of at least 1 year. This approach, referred to as exact recall, is thought to minimize problems with memory loss and avoids the problems inherent in trying to describe a respondent’s “usual” pattern of intake. First, the short recall period may not accurately represent the respondent’s typical consumption throughout the year, particularly in populations where drinking volumes or patterns vary according to season or are influenced by various holidays. www.niaaa.nih.gov /publications/arh27-1/18-29.htm   (317 words)

CSCE 410/810 HW 3 (b)        Then given the retrieved results (from your vector-space-modeled IR system that uses 0.2 as the similarity threshold and 10 as the number of documents to be retrieved), compute the recall and precision values. The goal of this exercise is to learn how to implement a retrieval system based on a simple Vector Space Model and evaluate the retrieval results in terms of recall and precision. Perform experiments in (a) parametric-tuning of your vector-space-modeled IR system, and (2) computing for recall and precision values and plotting precision vs. recall curves. cse.unl.edu /~lksoh/Classes/CSCE410_810_Fall03/hw3.html   (1369 words)

Clause Identification For all three parts of the shared task, the clause segmentation methods will be evaluated with the F rate, which is a combination of the precision and recall rates: F = 2*precision*recall / (recall+precision) [Rij79]. We have not used clauses labeled with FRAG or RRC, and all clause labels have been converted to S. The goal of this task is to come forward with machine learning methods which after a training phase can recognize the clause segmentation of the test data as well as possible. Clauses are word sequences which contain a subject and a predicate. www.cnts.ua.ac.be /conll2001/clauses   (1276 words)

Meta-Scoring: Automatically Evaluating Term Weighting Schema in IR without Precision-Recall In our experiments, we found out that this score is highly correlated with the precision-recall measurement for all the collections and term weighting schema we tried. In this paper, we present a method that can automatically evaluate performance of different term weighting schemes in information retrieval without resorting to precision-recall based on human relevance judgments. Meta-Scoring: Automatically Evaluating Term Weighting Schema in IR without Precision-Recall www.informedia.cs.cmu.edu /pubs/abstract.asp?id=115   (1276 words)

Minnesota Legislative News Allegations in a proposed recall petition must be made with sufficient precision and detail to enable the challenged official and the electorate to make informed decisions in the recall process. Because the allegations about the governor's book contract, his appearance at a wrestling event and a conflict of interest based on outrageous conduct relate to personal activities not specifically related to the performance of official duties, the conduct cannot be serious malfeasance in office as the legislature has defined that term in the recall statute. In response to the proposed petition for recall, the governor submitted a memorandumfrom the attorney general's office in which the governor's office was advised that it was permissible under existing statutes for state funds to be used to pay security personnel that accompanied the governor on his book tour. www.legal-ledger.com /archive/1020prim.htm   (1276 words)

Citations: ftp://ftp.cs.cornell.edu/pub/smart - eval (ResearchIndex) [trec eval] which is an evaluation tool developed for the Text Retrieval Conference (TREC) If we give a ranked document list given by a search engine and a set of correct documents to trec eval, we can obtain an eleven points of precision score, where recall scores are 0 to 1 at 0. ] which is an evaluation tool developed for the Text Retrieval Conference (TREC) If we give a ranked document list given by a search engine and a set of correct documents to trec eval, we can obtain an eleven points of precision score, where recall scores are 0 to 1 at 0. of papers collected by the search engine # F (F allout) The number of incorrect papers collected by the search engine # # # The number of papers that belong to categories other than a query # s category # For the calculation of precision and fallout, we made use of trec eval [ citeseer.ist.psu.edu /context/1988146/0   (263 words)

snowdeal.org > {bio,medical}informatics: Medical News Today: New algorithm for learning languages The performance of the modified algorithm achieved 32% recall with 95% precision, while the original one achieved 33% recall with 84% precision; the literature similarity requirement preserved the sensitive characteristic of the PSI-BLAST algorithm while improving the precision." Even with a Ph.D. and a long career in medical research, he cannot keep up with all the developments in his area of interest, breast cancer. The modified algorithm is evaluated and compared to standard PSI-BLAST in searching for homologous proteins. snowdeal.org /section/informatics/2005/09/medical-news-today-new-algorithm-for.html   (1361 words)

Webology: Titles and Subject Index Precision and Recall of Five Search Engines for Retrieval of Scholarly Information in the Field of Biotechnology Search engine, Precision and recall, Scholarly information, Structured and unstructured queries, World Wide Web Search strategies, Internet, New literacies, Information and Communication Technologies, Digital divide, Literacy skills, Learning technology www.webology.ir /titleindex.html   (448 words)

Extended Performance Graphs for Cluster Retrieval - Huijsmans, Sebe (ResearchIndex) However precision and recall values as such offer an incomplete overview of the information retrieval system under study: information about system parameters like generality (the embedding of the relevant fraction), random performance and the effect of varying the scope is badly missed. Abstract: Performance evaluations in Probabilistic Information Retrieval are often presented as Precision-Recall or PrecisionScope graphs avoiding the otherwise dominating effect of the embedding irrelevant fraction. citeseer.lcs.mit.edu /591051.html   (448 words)

Ch.3.html Retrieval of a cluster which is a good match for a request at a low level in the hierarchy tends to produce high precision* but low recall*; just as a cut-off at a low rank position in a linear search tends to yield high precision but low recall. Cluster representatives are computed for the members (sets) of the partition, and objects are reallocated to the nearest cluster representative. One method is to sample from the document collection and construct a core clustering using an n[2] method on the sample of the documents. www.dcs.gla.ac.uk /Keith/Chapter.3/Ch.3.html   (448 words)

Disambiguation for Text Mining on the Web We use the standard Precision and Recall measures: Precision denotes the ratio of spots correctly identified by the Disambiguator as on topic out of all the spots reported as being on topic. Disambiguation is done on a particular data-set, which consists of a set of source Web-pages, a set of subjects and a set of on/off topic terms for disambiguation. The Disambiguator tags each spot as being on topic or off topic, which is then used both to feed further processing stages, and displayed to the user together with the context and the evidence that led to the decision. www2003.org /cdrom/papers/poster/p302/final_poster/final_html_version.htm   (1529 words)

2002_JAMIA_Yu_abbrev.doc From Table 2, of defined abbreviations, the average recall and precision of the three medical experts was 0.8 and 1.0, respectively; AbbRE’s recall and precision of medical articles was 0.78 and 0.97, respectively. For example, AJT, which was used in the article body of a Lancet article, is an abbreviation of the author Andrew J Thomposn, which appeared in the author section of the article. The assumption is that all the abbreviations must be defined in the articles when the abbreviations are first introduced in literature and those articles may list in the citation. www.cpmc.columbia.edu /~hripcsa/Publication/2002_JAMIA_Yu_abbrev.doc   (5816 words)

Managing Gigabytes - Second Edition Errata Evaluating retrieval effectiveness: Recall and precision, Recall-precision curves, The TREC project, World Wide Web searching, Other effectiveness measures. Partially specified query terms: Brute force string matching, Indexing using n-grams, Rotated lexicons. Arithmetic coding: How arithmetic coding works, Implementing arithmetic coding, Maintaining cumulative counts. www.cs.mu.oz.au /mg/toc.html   (5816 words)

1999 DARPA BN Workshop Abstracts While precision and recall have served the information extraction community well as two separate measures of system performance, we show that the F-measure, the weighted harmonic mean of precision and recall, exhibits certain undesirable behaviors. This model was originally proposed by Gillick as a means to account for variation in word frequencies across documents more accurately than the binomial and multinomial models. Speaker identification is an important technology in this domain both for selecting high-accuracy speaker-dependent models for transcription and as an index for search and retrieval of video content. www.nist.gov /speech/publications/darpa99/html/abstract.htm   (5816 words)

The Fractal Nature of Semantics Query a system and construct several precision-recall curves using a variable size consisting of the top 10, 20,...100,... Examine the effect of N on the precision-recall curves. This passage inspired me to conduct several iterative experiments in which the SERPs from an IR system or search engine are taken for answer sets and tested as follows. www.miislita.com /fractals/fractal.html   (1865 words)

Ch.7.html To summarise, we have shown that it is reasonable to assume that effectiveness in terms of precision and recall determines an additive conjoint structure. So far we have discussed the properties of an additive conjoint structure and justified its use for the measurement of effectiveness based on precision and recall. Suppose = > is an additive conjoint structure, then there exist functions, [[Phi]]1 from R, and [[Phi]]2 from P into the real numbers such that, for all R, R' [[propersubset]] R and P, P' [[propersubset]] P:) <=> [[Phi]]1 ( R) + [[Phi]]2 ( P) >= [[Phi]]1 ( R') + [[Phi]]2 ( P') www.dcs.gla.ac.uk /Keith/Chapter.7/Ch.7.html   (1865 words)

Text Retrieval Quality: A Primer An ideal goal for a retrieval engine is to increase both precision and recall by making improvements to the engine, i.e., the entire curve must move up and out to the right so that both recall and precision are higher at every point along the curve. TREC is an annual conference for academic and industrial text retrieval systems conducted by the National Institute of Standards and Technology. Users want the retrieved documents to be ranked according to their relevance to the query instead of just being returned as a set. www.oracle.com /technology/products/text/htdocs/imt_quality.htm   (1865 words)

Integrating Data and Document Warehouses A document warehouse is a repository of textual information that is categorized and organized in such a way as to integrate semantically related texts so that they are accessible to end users and provide relatively high levels of information retrieval precision and recall in a decision-support environment. We are also painfully aware of the two persistent problems with search engines: poor precision (the number of relevant documents returned compared to the number of irrelevant documents) and poor recall (the number of documents returned from the set of all documents that should have been returned). Just as data warehouses are designed to accommodate numeric data and high-volume operations on that data, so too are document warehouses built to house textual information. www.dmreview.com /article_sub.cfm?articleId=3697   (2546 words)

Full text search - Wikipedia, the free encyclopedia Searches that use Boolean operators (for example, "encyclopedia" AND "online" NOT "Encarta") can dramatically increase the precision of a free text search. The deficiencies of free text searching have been addressed in two ways: By providing users with tools that enable them to express their search questions more precisely, and by developing new search algorithms that improve retrieval precision. However, a controlled vocabulary search may have low recall: it may fail to retrieve some documents that are actually relevant to the search question. en.wikipedia.org /wiki/Full_text_search   (772 words)

Citations: Indexing by latent semantic analysis - Deerwester, Dumais, Furnas, Landauer, Harshman (eBizSearch) Finally, we are analysing the possibility to validate these quasi similarity measures using precision and recall, and studying the effect of purging old queries from the Query Memory on the precision.... The semantic approach to retrieval characterizes the documents and queries so as to represent the underlying meaning [17, 36] It emphasizes natural language processing or the use of 12 AI like frames. Latent semantic indexing offers an improvement in the general setting but is not sufficient to allow for modeling.... gunther.smeal.psu.edu /context/28579/0   (772 words)

CMATH: Complex Number Math Functions for PC Compilers For double-precision complex numbers, use dcplx and dpolr, for extended-precision complex numbers, use ecplx and epolr. As far as the scope of CMATH overlaps with the complex class implementations of Visual C++, Borland C++, and Delphi, CMATH is a high-quality replacement for the latter, which are all quite inefficient and inaccurate. They work for two complex arguments or for one complex and one real argument. www.optivec.com /cmfuncs   (2912 words)

Automated Name Authority Control and Enhanced Searching in the Levy Collection Recall was favored (perhaps at the cost of precision) since the next step (disambiguation) should be able to catch some precision errors. Entries with high confidence can be treated like seed data and used to modify the seed group probabilities (Yarowsky 1995). The OMR software generates a logical representation of the score for sound generation, music searching, and musicological research. www.dlib.org /dlib/april01/dilauro/04dilauro.html   (3564 words)

Automated Name Authority Control and Enhanced Searching in the Levy Collection Recall was favored (perhaps at the cost of precision) since the next step (disambiguation) should be able to catch some precision errors. The ANAC disambiguates names, associating each name with an individual (e.g., the composer Septimus Winner also published under the pseudonyms Alice Hawthorne and Apsley Street, among others). Once the disambiguation process is completed, the authorized form of names that were matched to their LC name authority records will be added to the corresponding collection index record. www.dlib.org /dlib/april01/dilauro/04dilauro.html   (3564 words)

MRDs in WSD for Senseval-2 Using NODE as the disambiguation dictionary and mapping its senses into WordNet senses achieved comparable levels of precision, although recall was somewhat lower, as indicated by the difference in the number of items on which the precision was calculated. The dictionaries used for disambiguation operate in the background (as distinguished from the foreground development and maintenance of a dictionary), with rapid btree lookup to access and examine the characteristics of multiple senses of a word after a sentence has been parsed. Richardson, S. Determining similarity and inferring relations in a lexical knowledge base [Diss], New York, NY: The City University of New York. www.clres.com /senseval2.html   (2063 words)

MRDs in WSD for Senseval-2 Using NODE as the disambiguation dictionary and mapping its senses into WordNet senses achieved comparable levels of precision, although recall was somewhat lower, as indicated by the difference in the number of items on which the precision was calculated. The dictionaries used for disambiguation operate in the background (as distinguished from the foreground development and maintenance of a dictionary), with rapid btree lookup to access and examine the characteristics of multiple senses of a word after a sentence has been parsed. Given the very preliminary implementation of the disambiguation routines and lack of adequate debugging, the results indicate that using MRDs (and even mapping from one into another) shows considerable potential for unsupervised and general word-sense disambiguation. www.clres.com /senseval2.html   (2063 words)

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