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Ready to Begin?
Fill out the details of your study below. Once submitted, our statisticians will review your protocol and provide a comprehensive sample size report.
Required Documents
Detailed study protocol or synopsis
Reference articles for effect size
Primary outcome definition
Upload what's available. Synopsis mandatory
Ethical Note
We do not manipulate data to achieve desired significance levels. All calculations are strictly based on provided inputs and standard statistical principles.
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What You Receive
Recommended N
Detailed breakdown of total sample size required, including per-group counts and adjustments for anticipated attrition.
Methodological Justification
Ready-to-use write-up for your IRB/Ethics committee or protocol, explaining the statistical formulas and assumptions used.
Reference Citations
Full bibliographic references for the software, effect sizes, and formulas employed in your specific calculation.
The Importance of Sample Size
Sample size is the cornerstone of statistical power. An undersized study might fail to detect a truly effective treatment, wasting resources and potentially harming patients by missing breakthroughs.
Conversely, an oversized study is ethically questionable as it exposes more participants than necessary to experimental risks. Correct calculation ensures:
Resource Optimization
Reduce study costs and timelines by recruiting exactly what is needed.
Ethical Integrity
Minimize participant burden while fulfilling scientific objectives.
Statistical Power
Maximize the probability of finding significant results if they truly exist.