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Систематическая ошибка отбора
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Ошибка, вызванная систематическими различиями характеристик у тех, кто принимает участие в исследовании, и тех, кто в нем не участвует. пример:
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Selection bias, английский
- A systematic tendency for a sampling procedure to include and/or exclude units of a certain type. for example, in a quota sample, unconscious prejudices or predilections on the part of the interviewer can result in selection bias. selection bias is a potential problem whenever a human has latitude in selecting individual units for the sample; it tends to be eliminated by probability sampling schemes in which the interviewer is told exactly whom to contact (with no room for individual choice).
- A systematic difference between a target population and the sample of data. for example, data mining on customer complaint databases has a selection bias in that the data only capture customers who were motivated and able to contact the manufacturer about their complaint and does not capture complaints or customers who were not motivated nor able. self organizing map (som) a self organizing map is a form of kohonen network that arranges its clusters in a (usually) two-dimensional grid so that the codebook vectors (the cluster centers) that are close to each other on the grid are also close in the k-dimensional feature space. the converse is not necessarily true, as codebook vectors that are close in feature-space might not be close on the grid. the map is similar in concept to the maps produced by descriptive techniques such as multi-dimensional scaling (mds) self-stabilization a property of neural networks (e.g., art models). as a network trains itself on a finite number of cases, the various weights should gradually stabilize. see also: art, ftp:://ftp.sas.com/pub/neural/faq2.html, http://www.wi.leidenuniv.nl/art/.
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Характеристик, русский
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Систематический обзор, русский
Применение стратегий, которые ограничивают систематическую ошибку при сборе, критической оценке и синтезе исследований по конкретной теме. задача со — критический обзор публикаций по конкретной проблеме, связанной со здоровьем; в нем используются точные, стандартизированные методы отбора и оценки статей. со может включать количественный синтез результатов отдельных однородных исследований с помощью мета-анализа.
Symmetrical relationship, английский
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