🔬research
Sample Size Calculator
Determine the optimal sample size for your research with this comprehensive power analysis calculator. Features support for multiple statistical tests including t-tests, ANOVA, correlation, regression, and proportions. Includes interactive power curves, effect size guidelines based on Cohen's conventions, and detailed calculation results with formulas and references. Essential for research planning, grant applications, and ensuring your study has adequate statistical power to detect meaningful effects.
Key Features
- Power analysis for 9+ statistical test types
- Interactive power curve visualization
- Effect size presets (small, medium, large)
- Custom effect size input options
- Support for one-tailed and two-tailed tests
- Calculation history tracking
- Detailed results with formulas
- Test-specific parameter inputs
- Guidelines for effect sizes and power
- Sample size per group calculations
- References to statistical literature
- Tips for research planning
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