funnel plot

funnel plot

a graphic method of detecting publication bias. The estimate of risk derived from a set of epidemiologic studies used in a metaanalysis is plotted against sample size. If there is no publication bias, the plot is funnel-shaped; if studies giving significant results are more likely to be published than negative studies, the plot is asymmetric.
See also: metaanalysis.
A scatterplot of treatment effect against a measure of study size used primarily as a visual aid for detecting bias or systematic heterogeneity. A symmetric inverted funnel shape is seen in ‘well-behaved’ data for which publication bias is unlikely and which is thus suited for inclusion in a meta-analysis. An asymmetric funnel indicates a relationship between treatment effect and study size, due either to publication bias or a systematic difference between smaller and larger studies—‘small study effects’

fun·nel plot

(fŭn'ĕl plot)
A graphic method of detecting publication bias. The estimate of risk derived from a set of epidemiologic studies used in a metaanalysis is plotted against sample size. If there is no publication bias, the plot is funnel shaped; if studies giving significant results are more likely to be published than negative studies, the plot is asymmetric.
See also: metaanalysis
References in periodicals archive ?
Nevertheless, this funnel plot does not indicate "strongly suspected" publication bias.
Systematic Review and Meta-Analysis of Early-Life Exposure to Bisphenol A and Obesity-Related Outcomes in Rodents
Potential publication bias was investigated using funnel plot and Eager's test.
SYSTEMATIC REVIEW AND META-ANALYSIS OF ASSOCIATION OF [beta]2-ADRENERGIC RECEPTOR GENE POLYMORPHISMS WITH NOCTURNAL ASTHMA
Moreover, the publication bias in the full database were assessed using Egger's regression test for funnel plot asymmetry [31].
Production responses of Holstein dairy cows when fed supplemental fat containing saturated free fatty acids: a meta-analysis
Recommendations for examining and interpreting funnel plot asymmetry in meta-analyses of randomised controlled trials.
Alpha7 nAChR Agonists for Cognitive Deficit and Negative Symptoms in Schizophrenia: A Meta-analysis of Randomized Double-blind Controlled Trials
A funnel plot and Egger's tests were applied to evaluate publication bias across studies (a value of P < 0.
Glutathione S-transferase P1 Ile105Val Polymorphism and Male Infertility Risk: An Updated Meta-analysis
Whereas the funnel plot relies on the meta-analysis' qualitative interpretation of plot symmetry, statistical procedures can test for asymmetry.
Publication Bias in Special Education Meta-Analyses
On visual inspection, we observed an asymmetrical funnel plot.
Efficacy and safety of aceclofenac in osteoarthritis: A meta-analysis of randomized controlled trials
Multiple methods for assessing publication bias should be undertaken (Beretvas, 2010) in meta-analytic studies, and we subjected each design result to Duval and Tweedie's (2000; Richardson, Abraham, & Bond, 2012) trim-and-fill procedure, funnel plot analysis, and Rosenthal's (1979) fail-safe N.
Meta-analysis of counseling outcomes for youth with conduct disorders
What terms from the following list do you know sufficiently: standard deviation, sedimentation graph, forest plot, ANOVA, funnel plot, correlation, metaanalysis, regression analysis, ES".
Knowledge level of effect size statistics, confidence intervals and meta-analysis in spanish academic psychologists
The risk of publication bias was assessed by examining funnel plot asymmetry as well as Begg test and Egger test.
Metformin is associated with slightly reduced risk of colorectal cancer and moderate survival benefits in diabetes mellitus: a meta-analysis
This study used the funnel plot to show any bias in publication.
Effects of prophylactic ankle supports on vertical ground reaction force during landing: meta-analysis
Caption: FIGURE 3: Funnel plot in the meta-analysis demonstrating that there was no obvious indication of publication bias.
TP53 mutations and survival in osteosarcoma patients: a meta-analysis of published data
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