Letter re: stratification of meta-analyses based on risk of bias is appropriate and does not induce selection bias
نویسندگان
چکیده
منابع مشابه
Selection Bias in Meta-Analyses of Gene-Disease Associations
1226 M any studies have too small a sample size for their fi ndings to be conclusive, but large studies are expensive and time-consuming. Meta-analysis is an alternative to conducting large studies in tackling the problem of small sample size, by combining available small studies to increase the total sample size. Since the 1980s, meta-analysis has been widely used in summarizing results from c...
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while performance-based language assessment has led to an increased authenticity and content validity in the practice of writing assessment, the reliability of ratings has become a major issue. research findings have shown different reactions by native english speaker (nes) and non-native english speaker (nns) teachers to students’ writings. the focus of this study is on investigating whether i...
Empirical assessment of effect of publication bias on meta-analyses.
OBJECTIVE To assess the effect of publication bias on the results and conclusions of systematic reviews and meta-analyses. DESIGN Analysis of published meta-analyses by trim and fill method. STUDIES 48 reviews in Cochrane Database of Systematic Reviews that considered a binary endpoint and contained 10 or more individual studies. MAIN OUTCOME MEASURES Number of reviews with missing studie...
متن کاملA Comparison of the Effectiveness of Cognitive Bias Modification in Real and Placebo Conditions on Attentional Bias and Approach Bias in Opium Abusers
Background & Aim: Inability to control drug use is considered a core aspect of drug dependency. Part of this inability is due to cognitive biases resulting from individuals’ constant usage of drugs. The aim of the present study was to compare the effectiveness of cognitive bias modification in real and placebo conditions on attentional bias and approach bias in opium abusers. Methods: This stud...
متن کاملPublication Bias in Recent Meta-Analyses
INTRODUCTION Positive results have a greater chance of being published and outcomes that are statistically significant have a greater chance of being fully reported. One consequence of research underreporting is that it may influence the sample of studies that is available for a meta-analysis. Smaller studies are often characterized by larger effects in published meta-analyses, which can be pos...
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ژورنال
عنوان ژورنال: Journal of Clinical Epidemiology
سال: 2019
ISSN: 0895-4356
DOI: 10.1016/j.jclinepi.2019.06.003