Results 21 to 30 of about 1,709,075 (283)
Meta-analysis of political communication research on Twitter: Methodological trends
Cogent Social Sciences, 2023 This meta-analysis examines the methodological tendencies of scientific research about political communication on Twitter published in journals based on Spanish-speaking countries between 2019 and 2021.
Miguel Álvarez-Peralta +2 more
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Frontiers in Marine Science, 2023 The Southern Ocean is a productive and biodiverse region, but it is also threatened by anthropogenic pressures. Protecting the Southern Ocean should start with well-informed Marine Ecosystem Assessments of the Southern Ocean (MEASO) being performed, a ...
Anne-Sophie Bonnet-Lebrun +10 more
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Bias Reduction in Sample-Based Optimization [PDF]
SIAM Journal on Optimization, 2022 We consider stochastic optimization problems which use observed data to estimate essential characteristics of the random quantities involved. Sample average approximation (SAA) or empirical (plug-in) estimation are very popular ways to use data in optimization. It is well known that sample average optimization suffers from downward bias.
Darinka Dentcheva, Yang Lin
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Frontiers in Marine Science, 2023 Despite the importance of calanoid copepods to healthy ecosystem functioning of the Arctic Ocean and Subarctic Seas, many aspects of their biogeography, particularly in winter months, remain unresolved.
Jennifer J. Freer, Geraint A. Tarling
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Scholarpedia, 2008 Sampling bias means that the samples of a stochastic variable that are collected to determine its distribution are selected incorrectly and do not represent the true distribution because of non-random reasons. Let us consider a specific example: we might want to predict the outcome of a presidential election by means of an opinion poll.
Panzeri, S., Magri, C., Carraro, L.
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Methods in Ecology and Evolution, 2023 Identifying the drivers that promote unique species compositions (i.e. ecological uniqueness) is crucial to understanding the mechanisms underpinning diversity patterns and for effective conservation planning.
Toby P. N. Tsang +3 more
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Bias in early coronavirus disease 2019 research
Saudi Journal for Health Sciences, 2021 In the context of the ongoing global pandemic of coronavirus disease 2019 (COVID-19), most scientific evidence related to disease transmission and clinical outcomes, especially in the first wave, originated from observational studies.
Fatmah Mahmoud Othman
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Journal of Field Ornithology, 2023 Mist-nets are one of the most important tools for the capture of wild birds in ornithological research. The probability of capturing birds may vary by net height, which may drive capture biases.
D. Julian Tattoni, Katie LaBarbera
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Sampling bias in physiotherapy research
South African Journal of Physiotherapy, 1986 In this article the difference between random error (due to sampling variability) and systematic error (or bias) is briefly illustrated. Major types of systematic error which occur due to errors in sampling are discussed briefly with reference to the ...
J. A. Hendry
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Adaptive k-tree sample plot for the estimation of stem density: An empirical approach
Journal of Forest Science, 2018 Available budgets for the inventory of non-commercial woodlands are small. Therefore, there has been increased interest in using distance methods, such as k-tree sampling, which are faster than fixed plot sampling.
Hormoz SOHRABI
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