Meta-Analysis & Forest Plot Guides
Clear, practical explanations of the statistics behind every forest plot, written for researchers running their own meta-analysis.
June 18, 2026 · 8 minHow to Make a Forest Plot for Your Meta-AnalysisA practical guide to making a forest plot, from the data you need to the fastest online route and a short R outline.Read guide June 16, 2026 · 8 minHazard Ratio Interpretation in Survival StudiesWhat a hazard ratio above, below, or equal to 1 means, why it is a rate ratio rather than a cumulative risk, and how its logarithm is pooled in a meta-analysis.Read guide June 16, 2026 · 7 minPrediction Intervals in Meta-AnalysisThe prediction interval shows where a new study’s true effect will land, a wider and more honest range than the confidence interval of the pooled estimate.Read guide June 11, 2026 · 8 minRelative vs Absolute Risk ReductionHow relative risk reduction differs from absolute risk reduction, why an impressive relative figure can hide a tiny real benefit, and what to report.Read guide June 11, 2026 · 7 minForest Plot vs Funnel Plot: What Each ShowsThe forest plot reports the combined effect; the funnel plot tests whether small negative studies are missing. Here is how each works and why you need both.Read guide June 9, 2026 · 8 minCochran's Q Test for HeterogeneityHow Cochran's Q test detects heterogeneity in a meta-analysis, how to read its p-value, and how it feeds the I-squared and tau-squared statistics.Read guide June 5, 2026 · 8 minOdds Ratio vs Risk Ratio: Which to UseHow the odds ratio and the risk ratio differ, why they diverge for common outcomes, and which effect measure to report in a meta-analysis.Read guide June 5, 2026 · 8 minUnderstanding I-Squared and HeterogeneityWhat I-squared and statistical heterogeneity actually measure, how to read the thresholds, and what to do when between-study variation runs high.Read guide June 2, 2026 · 8 minOdds Ratio Interpretation, Made SimpleHow to read an odds ratio against the null value of 1, judge significance from its confidence interval, and avoid overstating effects for common outcomes.Read guide June 2, 2026 · 9 minFixed-Effect vs Random-Effects Meta-AnalysisHow the fixed-effect and random-effects models differ in their assumptions, weighting, pooled estimate, and confidence interval, and how to choose and defend one.Read guide May 29, 2026 · 9 minWhat Is a Meta-Analysis? A Researcher’s GuideA practical, end-to-end explanation of what a meta-analysis is, how studies are pooled and weighted, and when combining them is appropriate.Read guide May 28, 2026 · 8 minHow to Read a Forest Plot, Step by StepA practical, element-by-element walkthrough of every part of a forest plot, from the study squares to the pooled summary diamond.Read guide May 26, 2026 · 8 minNumber Needed to Treat, ExplainedHow the number needed to treat is calculated from the absolute risk reduction, how to interpret it, and how it is derived from a pooled meta-analysis.Read guide May 19, 2026 · 8 minEffect Size and Cohen's d ExplainedWhat an effect size is, how Cohen's d standardizes a mean difference, what its benchmarks mean, and why meta-analysis pools effect sizes rather than p-values.Read guide May 12, 2026 · 9 minNetwork Meta-Analysis: A Practical GuideHow a network meta-analysis combines direct and indirect evidence to compare many treatments, plus the assumptions and pitfalls behind treatment rankings.Read guide May 5, 2026 · 8 minPublication Bias in Meta-AnalysisHow publication bias distorts a meta-analysis, the methods used to detect it, and the prospective registration and grey-literature searching that prevent it.Read guide April 28, 2026 · 8 minSystematic Review vs Meta-Analysis: The DifferenceWhy a systematic review is the whole rigorous process and a meta-analysis is only the optional statistical step that pools the results within it.Read guide April 15, 2026 · 8 minConfidence Interval Interpretation, Made ClearWhat a confidence interval really tells you, the misreading almost everyone makes, and how to interpret width, significance, and the 1.96 multiplier correctly.Read guide