Sign Test

Sign Test helps you evaluate changes in paired before-and-after data through a simple, visual, and easy-to-understand workflow. Simply enter your paired values. The app determines the direction of each change, summarizes increases and decreases, excludes ties as required by the sign test, and calculates a p-value based on the binomial distribution. Key features: - Sign test calculations for paired data - Two-sided and one-sided alternatives - Exact binomial p-values for small samples - Normal approximation for large datasets - Clear and informative null-distribution charts - Visual sign tokens and an easy-to-read balance bar - Interactive simulations for exploring probability - Practical worked examples - Mathematical formulas available offline - Saved input data for your next session Designed for students, educators, researchers, analysts, and anyone who needs a practical nonparametric test for comparing two paired measurements. The sign test focuses on the direction of change rather than the size of each difference. This makes it useful when parametric distribution assumptions are not appropriate or when you need a concise and robust analysis. Please note: This app is intended as a learning and analysis tool. Interpret results within the context of your research and consider consulting a qualified statistician for important decisions.