MetaSyn Statistical Converter: Meta-Analysis

MetaSyn Statistical Converter is a free, browser-local statistical conversion tool for meta-analysis and evidence synthesis. It helps researchers transform selected already-reported statistical quantities into supported meta-analysis-ready representations while keeping the formula, analysis scale, assumptions, warnings and uncertainty source visible. Supported operations in version 1: • Standard error (SE) → sampling variance • Sampling variance → SE • Two-sided Wald confidence interval → SE + sampling variance • OR, RR, HR or rate ratio + two-sided Wald CI → natural-log effect + SE + sampling variance • Ratio estimate ↔ natural-log ratio estimate • Natural-log ratio + SE or sampling variance → ratio estimate + Wald confidence interval Methodological transparency: • Shows the calculation and analysis scale • Requires explicit acknowledgement for supported Wald-CI reconstructions • Warns when interval asymmetry may be incompatible with the assumed Wald form • Keeps full-precision values internally and separates display rounding from calculation What it does not do: • It does not select the appropriate effect measure for you • It does not calculate effect sizes from raw 2×2 or continuous-group study data • It does not estimate means or SDs from medians, ranges or IQRs • It does not treat t-based, profile-likelihood, exact, bootstrap, Bayesian or one-sided confidence intervals as ordinary Wald intervals • It does not reconstruct uncertainty generically from P, t, F or z statistics in version 1 Validation: Version 1.0.4 uses the same validated statistical engine as the prior release and passed the predefined 220-case suite: 200 direct cases plus 20 cross-method/round-trip cases. Passing this suite is evidence of predefined test performance, not a universal accuracy guarantee. Privacy: Calculations run locally in the browser. The extension has no account system, analytics, advertising, backend API, browsing-history access, content scripts or host permissions, and it does not save calculation history. Methodology and validation: https://metasyn.academy/free-systematic-review-templates/meta-analysis-statistical-converter/ Privacy policy: https://metasyn.academy/free-systematic-review-templates/meta-analysis-statistical-converter/privacy/ Academic support: https://metasyn.academy/contact-support-faq/ MetaSyn Statistical Converter is an independent MetaSyn Academy research tool. It is not affiliated with or endorsed by Cochrane, the metafor project, or any publisher or standards organization.