Meta-analysis in R: Forest Plots for Effective Data Representation
Explore how to create forest plots in R using Metafor for effective visualization of effect sizes, confidence intervals, moderators, and cumulative data. Understand the nature of data through sorted and aggregated plots. Utilize forest plots for comprehensive data analysis and interpretation in meta-analytic studies.
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Presentation Transcript
Meta-analysis in R with Metafor 12: Forest Plots Ordinary, sorted, moderator, cumulative
Forest Plots The forest plot is a graph that typically shows effect sizes along with confidence intervals for each effect size. It is conventional to include an overall mean at the bottom of the graph. The forest plot is very useful for understanding the nature of the data. Very useful for representing moderators. Forest plots can also show aggregates of effect sizes, such as a cumulative effect size plot, which shows the mean as studies accrue over time (the leave- one-out forest plot will be covered under diagnostics and sensitivity analyses).
R Code McLeod (2007) data in z Unsorted forest Sorted by ES Sorted by V (precision) Moderator test, sorted by moderator and ES Rockstuhl (2012) data in z Sorted by Year Cumulative plot by Year
RocksData Plots Cumulative by Year ES by year Study 1 -0.14 [ -0.28 , 0.00 ] Study 1 -0.14 [ -0.28 , 0.00 ] + Study 2 -0.16 [ -0.27 , -0.05 ] Study 2 -0.20 [ -0.40 , 0.00 ] + Study 3 -0.12 [ -0.21 , -0.04 ] Study 3 -0.08 [ -0.21 , 0.05 ] + Study 4 -0.12 [ -0.19 , -0.05 ] Study 4 -0.10 [ -0.24 , 0.04 ] Study 5 0.04 [ -0.08 , 0.16 ] + Study 5 -0.08 [ -0.16 , -0.01 ] Study 6 0.05 [ -0.10 , 0.20 ] + Study 6 -0.06 [ -0.14 , 0.01 ] Study 7 0.08 [ -0.02 , 0.18 ] + Study 7 -0.04 [ -0.12 , 0.04 ] Study 8 0.06 [ -0.09 , 0.22 ] + Study 8 -0.03 [ -0.10 , 0.04 ] Study 9 0.14 [ 0.03 , 0.25 ] + Study 9 -0.01 [ -0.08 , 0.07 ] Study 10 0.38 [ 0.22 , 0.54 ] + Study 10 0.03 [ -0.07 , 0.12 ] RE Model 0.03 [ -0.07 , 0.12 ] -0.30 -0.10 0.10 0.20 Fisher's z Transformed Correlation Coefficient -0.60 -0.20 0.20 0.60 Fisher's z Transformed Correlation Coefficient
