Selection Bias and Information Bias in Clinical Research
نویسندگان
چکیده
منابع مشابه
Selection bias and information bias in clinical research.
The internal validity of an epidemiological study can be affected by random error and systematic error. Random error reflects a problem of precision in assessing a given exposure-disease relationship and can be reduced by increasing the sample size. On the other hand, systematic error or bias reflects a problem of validity of the study and arises because of any error resulting from methods used...
متن کاملBias in Medical/Clinical Research
Learning from clinical experience (whether during formal research or in the course of patient care) is impeded by mainly two processes: bias and chance. Medical research results many times become inconclusive because some bias is detected after the results are available. A dictionary definition of ‘bias’ is ‘a onesided inclination of the mind. In statistics, ‘bias’ is ‘systematic error’ that ca...
متن کاملBias in Medical/Clinical Research
Learning from clinical experience (whether during formal research or in the course of patient care) is impeded by mainly two processes: bias and chance. Medical research results many times become inconclusive because some bias is detected after the results are available. A dictionary definition of ‘bias’ is ‘a onesided inclination of the mind. In statistics, ‘bias’ is ‘systematic error’ that ca...
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Language technology is biased toward English newswire. In POS tagging, we get 97–98 words right out of a 100 in English newswire, but results drop to about 8 out of 10 when running the same technology on Twitter data. In dependency parsing, we are able to identify the syntactic head of 9 out of 10 words in English newswire, but only 6–7 out of 10 in tweets. Replace references to Twitter with re...
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a r t i c l e i n f o The tendency of meta-analytic authors to select particular studies is called selection bias. Selection bias can affect the strength of the meta-analytic estimate and the attention that scholars devote to the results. This research is, in effect, a meta-analysis of the effect sizes reported or calculated from 94 meta-analysis studies of various topics in marketing research....
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ژورنال
عنوان ژورنال: Nephron Clinical Practice
سال: 2010
ISSN: 1660-2110,1660-2110
DOI: 10.1159/000312871