PRISMA & Study Selection Tools

Plan and document the search and screening stages of a systematic or scoping review.

Risk of Bias & Quality Assessment Tools

Appraise included studies with the recognised risk-of-bias and critical appraisal tools.

Meta-Analysis Calculators & Plots

Calculate effect sizes, pool results and create the plots journals expect in a meta-analysis.

Effect Size Calculator

Calculate Cohen's d, Hedges' g, odds ratios, risk ratios and correlations from means, counts or test statistics.

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I² Heterogeneity Calculator

Calculate I², Cochran's Q, tau² and prediction intervals for a meta-analysis.

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Forest Plot Generator

Create publication-ready forest plots online, with subgroups, random-effects models and prediction intervals.

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Multilevel Meta-Analysis Tool

Model dependent effect sizes nested within studies with a three-level random-effects meta-analysis.

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Funnel Plot Generator

Draw contour-enhanced funnel plots with Egger's test and trim-and-fill to assess publication bias.

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Relative Risk Calculator

Calculate relative risk (risk ratio) with confidence intervals from a 2x2 table.

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Odds Ratio Calculator

Calculate an odds ratio with a 95% confidence interval from a 2x2 table.

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Number Needed to Treat Calculator

Calculate NNT and number needed to harm from risks, odds ratios or risk ratios.

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Meta-Regression Data Builder

Prepare study-level moderator data for meta-regression in R, Stata or CMA.

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Leave-One-Out Sensitivity Analysis

See how the pooled estimate changes when each study is removed in turn.

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P-Curve Analysis

Check whether a set of significant findings shows evidential value or signs of p-hacking.

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Doi Plot & LFK Index

Assess publication bias with the Doi plot and LFK index, useful when there are few studies.

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Sensitivity & Specificity Calculator

Calculate sensitivity, specificity, predictive values and likelihood ratios from a 2x2 table.

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Bayes Factor Calculator

Calculate Bayes factors for t-tests, correlations and proportions, with interpretation guidelines.

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Meta-Analysis of Proportions

Pool prevalence or single-arm proportions using logit or Freeman-Tukey transformations.

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L'Abbé Plot Generator

Plot treatment versus control event rates to visualise heterogeneity in binary outcomes.

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GOSH Plot Generator

Explore heterogeneity and influential studies across all subsets of a meta-analysis.

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Meta-Regression Bubble Plot

Plot effect sizes against a moderator with precision-weighted bubbles and a regression line.

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Effect Size Converter

Convert between Cohen's d, odds ratio, correlation r and other effect size measures.

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Trial Sequential Analysis Calculator

Calculate the required information size and monitoring boundaries for cumulative meta-analysis.

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Network Meta-Analysis Helper

Draw network diagrams, check network connectivity and format data for netmeta.

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Mantel-Haenszel & Peto Odds Ratio

Pool 2x2 tables with the Mantel-Haenszel or Peto method, including rare events.

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Fagan Nomogram Calculator

Convert pre-test to post-test probability using likelihood ratios for diagnostic tests.

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SROC Curve Generator

Plot a summary ROC curve for diagnostic test accuracy meta-analysis.

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Publication Bias Selection Model

Estimate how publication bias may shift a pooled effect using weight-function selection models.

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Prediction Interval Calculator

Show the likely range of true effects in a random-effects meta-analysis.

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Statistics Calculators

Free online statistics calculators for dissertations, theses and research papers.

Logistic Regression Calculator

Fit a binary logistic regression online and get odds ratios with 95% confidence intervals.

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Table 1 Generator

Create a baseline characteristics table (Table 1) with the right group-comparison tests.

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Which Statistical Test Should I Use?

Answer a few questions about your data and design to find the right statistical test.

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McNemar Test Calculator

Compare paired proportions with the McNemar test, including the exact version.

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Cronbach's Alpha Calculator

Check scale reliability with Cronbach's alpha and item-total statistics.

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Kruskal-Wallis Test Calculator

Compare three or more groups without assuming normality, with a tie-corrected H statistic.

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Mann-Whitney U Test Calculator

Compare two independent groups with the Mann-Whitney U (Wilcoxon rank-sum) test.

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Fisher's Exact Test Calculator

Test association in a 2x2 table when samples or expected counts are small.

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ANOVA Calculator

Run a one-way ANOVA online from raw data or from means and standard deviations.

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Binomial Probability Calculator

Calculate exact binomial probabilities and cumulative probabilities.

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Variance & Standard Deviation Calculator

Calculate sample and population variance and standard deviation.

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Z-Score Calculator

Convert values to z-scores and find probabilities under the normal distribution.

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P-Value Calculator

Find p-values from t, z, F or chi-square statistics.

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Confidence Interval from P-Value

Work back from a p-value to a confidence interval, and vice versa.

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Confidence Interval Calculator

Calculate confidence intervals for a mean or a proportion.

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Linear Regression Calculator

Fit a linear regression online and get coefficients, R² and p-values.

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T-Test Calculator

Run one-sample, independent and paired t-tests online.

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Kaplan-Meier Curve Digitizer

Extract survival data from a published Kaplan-Meier curve image.

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Correlation Calculator

Calculate Pearson and Spearman correlation coefficients with p-values.

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Convert r to d

Convert a correlation coefficient r to Cohen's d effect size, and back.

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Standard Error to Standard Deviation Converter

Convert standard error to standard deviation, and SD to SE.

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Median to Mean & SD Converter

Estimate mean and standard deviation from median, range or IQR for meta-analysis.

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Chi-Square Calculator

Run a chi-square test of independence for 2x2 and larger tables.

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Power Analysis & Sample Size Calculator

Calculate sample size and statistical power for t-tests and two proportions.

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ICC Calculator (Intraclass Correlation)

Measure inter-rater reliability with the intraclass correlation coefficient.

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Protocol & Reporting Helpers

Templates and helpers for protocols, data extraction and manuscript preparation.

Bioinformatics & Sequence Tools

Quick online tools for DNA sequences and gene expression analysis.

Nursing & Clinical Documentation

Templates that help nursing students and clinicians structure clinical documentation.

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Free Tools: Frequently Asked Questions

What free tools does TimelyScholar offer?

94 free research tools across seven areas: PRISMA and study selection, risk of bias assessment, meta-analysis calculators and plots, statistics calculators, protocol and reporting helpers, bioinformatics, and nursing documentation.

Are the tools free, and do I need an account?

Yes. Every tool is free to use and none requires an account. Most tools run entirely in your browser, so your data is not uploaded; the few that look up references or search counts say so on their page.

Which tool makes a PRISMA flow diagram?

The PRISMA Flow Diagram Generator. You enter the numbers of records identified, screened, excluded and included, and it produces a diagram that follows PRISMA 2020.

Can TimelyScholar run the analysis for me instead?

Yes. If you would rather have a specialist do the work, our PhD-led team offers systematic reviews, meta-analysis and statistical analysis. Request a free quote and we reply within 2-4 business hours. Request a free quote.

Need more than a free tool?

Describe your project and a specialist will reply with an itemized quote within 2-4 business hours.