NCSS PASS refers to two distinct software products from the company NCSS, LLC. PASS is specifically for power analysis and sample size determination, while NCSS is a broader statistical analysis and graphics application.
PASS: Power Analysis and Sample Size Software
- Core function: To calculate the ideal sample size for a study or determine the statistical power of a study that already has a fixed sample size.
- Purpose: Ensures that a research study is neither too large (which wastes resources) nor too small (which may fail to detect a real effect). It is critical for clinical trials, medical research, grant proposals, and other research where precise planning is essential.
Key features:
- Extensive procedures: Includes tools for over 1,200 statistical tests and confidence interval scenarios, covering analyses such as comparing means and proportions, regression, survival analysis, and more.
- Validated algorithms: Each procedure has been validated against published literature to ensure accuracy.
- Comprehensive output: Provides not only the sample size results but also customizable power and sample size curves, which can be easily saved or exported.
- User-friendly interface: The software features an intuitive interface with built-in help messages and extensive documentation.
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NCSS PASS 2026
NCSS PASS 2025