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Quantification (machine Learning)
In machine learning and data mining, quantification (variously called ''learning to quantify'', or ''supervised prevalence estimation'', or ''class prior estimation'') is the task of using supervised learning in order to train models (''quantifiers'') that estimate the relative frequencies (also known as prevalence ''values'') of the classes of interest in a sample of unlabelled data items. For instance, in a sample of 100,000 unlabelled tweets known to express opinions about a certain political candidate, a quantifier may be used to estimate the percentage of these 100,000 tweets which belong to class `Positive' (i.e., which manifest a positive stance towards this candidate), and to do the same for classes `Neutral' and `Negative'. Quantification may also be viewed as the task of training predictors that estimate a (discrete) probability distribution, i.e., that generate a predicted distribution that approximates the unknown true distribution of the items across the classes of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machine Learning
Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so. Machine learning algorithms are used in a wide variety of applications, such as in medicine, email filtering, speech recognition, agriculture, and computer vision, where it is difficult or unfeasible to develop conventional algorithms to perform the needed tasks.Hu, J.; Niu, H.; Carrasco, J.; Lennox, B.; Arvin, F.,Voronoi-Based Multi-Robot Autonomous Exploration in Unknown Environments via Deep Reinforcement Learning IEEE Transactions on Vehicular Technology, 2020. A subset of machine learning is closely related to computational statistics, which focuses on making predicti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wiley (publisher)
John Wiley & Sons, Inc., commonly known as Wiley (), is an American multinational publishing company founded in 1807 that focuses on academic publishing and instructional materials. The company produces books, journals, and encyclopedias, in print and electronically, as well as online products and services, training materials, and educational materials for undergraduate, graduate, and continuing education students. History The company was established in 1807 when Charles Wiley opened a print shop in Manhattan. The company was the publisher of 19th century American literary figures like James Fenimore Cooper, Washington Irving, Herman Melville, and Edgar Allan Poe, as well as of legal, religious, and other non-fiction titles. The firm took its current name in 1865. Wiley later shifted its focus to scientific, technical, and engineering subject areas, abandoning its literary interests. Wiley's son John (born in Flatbush, New York, October 4, 1808; died in East Orange, New Jer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecological Modelling
''Ecological Modelling'' is a monthly peer-reviewed scientific journal covering the use of ecosystem models in the field of ecology. It was founded in 1975 by Sven Erik Jørgensen Sven Erik Jørgensen (29 August 1934 – 5 March 2016) was an ecologist and chemist. Biography Also a well known biathlon person. Academic degrees and honors In 1958, he was awarded Master of Science in chemical engineering from the Tec ... and is published by Elsevier. The current editor-in-chief is Brian D. Fath ( Towson University). According to the '' Journal Citation Reports'', the journal has a 2016 impact factor of 2.363. References External links * Ecology journals Elsevier academic journals Monthly journals Publications established in 1975 English-language journals {{Ecology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Market Research
Market research is an organized effort to gather information about target markets and customers: know about them, starting with who they are. It is an important component of business strategy and a major factor in maintaining competitiveness. Market research helps to identify and analyze the needs of the market, the market size and the competition. Its techniques encompass both qualitative techniques such as focus groups, in-depth interviews, and ethnography, as well as quantitative techniques such as customer surveys, and analysis of secondary data. It includes social and opinion research, and is the systematic gathering and interpretation of information about individuals or organizations using statistical and analytical methods and techniques of the applied social sciences to gain insight or support decision making. Market research, marketing research, and marketing are a sequence of business activities; sometimes these are handled informally. The field of ''marketing researc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statistical Science
''Statistical Science'' is a review journal published by the Institute of Mathematical Statistics. The founding editor was Morris H. DeGroot, who explained the mission of the journal in his 1986 editorial: "A central purpose of ''Statistical Science'' is to convey the richness, breadth and unity of the field by presenting the full range of contemporary statistical thought at a modest technical level accessible to the wide community of practitioners, teachers, researchers and students of statistics and probability." Editors * 2017-2019 Cun-Hui Zhang * 2014-2016 Peter Green (statistician), Peter Green * 2011-2013 Jon Wellner * 2008-2010 David Madigan * 2005-2007 Ed George * 2002-2004 George Casella * 2001 Morris Eaton * 2001 Richard Tweedie * 1998-2000 Leon Gleser * 1995-1997 Paul Switzer * 1992-1994 Rob Kass, Robert E. Kass * 1989-1991 Carl Morris (statistician), Carl N. Morris * 1985-1989 Morris H. DeGroot References Further rea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epidemiology
Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population. It is a cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare. Epidemiologists help with study design, collection, and statistical analysis of data, amend interpretation and dissemination of results (including peer review and occasional systematic review). Epidemiology has helped develop methodology used in clinical research, public health studies, and, to a lesser extent, basic research in the biological sciences. Major areas of epidemiological study include disease causation, transmission, outbreak investigation, disease surveillance, environmental epidemiology, forensic epidemiology, occupational epidemiology, screening, biomonitoring, and comparisons of treatment effects such as in clinical trials. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Journal Of Political Science
The ''American Journal of Political Science'' is a journal published by the Midwest Political Science Association. It was formerly known as the ''Midwest Journal of Political Science''. According to the ''Journal Citation Reports'', the journal has a 2016 impact factor of 5.044, ranking it 1st out of 165 journals in the category "Political Science". According to SCImago Journal & Country Rank it ranks 3rd best in the field of Political Science and Sociology. Also by other authors it is ranked among 5 best journals in political science. The journal publishes articles on all areas of political science. See also * William G. Jacoby * List of political science journals This is a list of political science journals presenting representative academic journals in the field of political science. A *''Acta Politica'' *''African Affairs'' *''American Journal of Political Science'' *''American Political Science Revi ... * 2010 conservatism-psychoticism correlation error Further r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Social Sciences
Social science is one of the branches of science, devoted to the study of societies and the relationships among individuals within those societies. The term was formerly used to refer to the field of sociology, the original "science of society", established in the 19th century. In addition to sociology, it now encompasses a wide array of academic disciplines, including anthropology, archaeology, economics, human geography, linguistics, management science, communication science and political science. Positivist social scientists use methods resembling those of the natural sciences as tools for understanding society, and so define science in its stricter modern sense. Interpretivist social scientists, by contrast, may use social critique or symbolic interpretation rather than constructing empirically falsifiable theories, and thus treat science in its broader sense. In modern academic practice, researchers are often eclectic, using multiple methodologies (for instance, by c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth Mover's Distance
In statistics, the earth mover's distance (EMD) is a measure of the distance between two probability distributions over a region ''D''. In mathematics, this is known as the Wasserstein metric. Informally, if the distributions are interpreted as two different ways of piling up a certain amount of earth (dirt) over the region ''D'', the EMD is the minimum cost of turning one pile into the other; where the cost is assumed to be the amount of dirt moved times the distance by which it is moved. The above definition is valid only if the two distributions have the same integral (informally, if the two piles have the same amount of dirt), as in normalized histograms or probability density functions. In that case, the EMD is equivalent to the 1st Mallows distance or 1st Wasserstein distance between the two distributions. Theory Assume that we have a set of points in \mathbb^d (dimension d). Instead of assigning one distribution to the set of points, we can cluster them and represe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pearson Divergence
Pearson may refer to: Organizations Education *Lester B. Pearson College, Victoria, British Columbia, Canada * Pearson College (UK), London, owned by Pearson PLC *Lester B. Pearson High School (other) Companies *Pearson PLC, a UK-based international media conglomerate, best known as a book publisher **Pearson Education, the textbook division of Pearson PLC *** Pearson-Longman, an imprint of Pearson Education * Pearson Yachts Places * Pearson, California (other) * Pearson, Georgia, a US city *Pearson, Texas, an unincorporated community in the US * Pearson, Victoria, a ghost town in Australia *Pearson, Wisconsin, an unincorporated community in the US * Toronto Pearson International Airport, in Toronto, Ontario, Canada * Pearson Field, in Vancouver, Washington, US * Pearson Island, an island in South Australia which is part of the Pearson Isles * Pearson Isles, an island group in South Australia Other uses * Pearson (surname) * Pearson correlation coefficient, a sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Information Retrieval Journal
Information is an abstract concept that refers to that which has the power to inform. At the most fundamental level information pertains to the interpretation of that which may be sensed. Any natural process that is not completely random, and any observable pattern in any medium can be said to convey some amount of information. Whereas digital signals and other data use discrete signs to convey information, other phenomena and artifacts such as analog signals, poems, pictures, music or other sounds, and currents convey information in a more continuous form. Information is not knowledge itself, but the meaning that may be derived from a representation through interpretation. Information is often processed iteratively: Data available at one step are processed into information to be interpreted and processed at the next step. For example, in written text each symbol or letter conveys information relevant to the word it is part of, each word conveys information ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
