Power Analysis and Sample Size Determination for Confident Research
Proper sample size calculation is the foundation of credible research. Our precise power analyses ensure your study has the right balance between statistical rigor and practical feasibility.
Avoid False Negatives
Ensure adequate statistical power (typically 80-90%) to detect true effects when they exist, reducing Type II errors.
Optimize Resources
Prevent wasteful over-recruitment while ensuring sufficient data for meaningful conclusions in your research study design.
Justify Your Methods
Strengthen grant proposals and publications with rigorous power analysis documentation.
Our Calculation Process
Define Research Parameters
We collaborate to determine your primary outcome, effect size, significance level (α), and desired power (1-β) for your clinical trial statistics.
Select Appropriate Test
We identify the correct statistical test for your study design (t-test, ANOVA, regression, etc.).
Calculate Sample Size
Using statistical software, we compute the minimum required sample size for your parameters.
Adjust for Practical Factors
We account for expected attrition rates, clustering effects, or multiple comparisons as needed in your survey research.
Deliverables You Receive
Our comprehensive report includes:
- Precise Sample Size: The exact number of participants needed for each study arm
- Power Analysis: Documentation of all assumptions and calculations
- Power Curve: Visual representation of power vs. sample size relationship
- Methodology Summary: Ready-to-use text for your research protocol
- Sensitivity Analysis: How changes in parameters affect required sample size
- Software Output: Raw calculations from R, PASS, or other professional tools
Common Study Types We Support
Clinical Trials
RCTs, non-inferiority, and equivalence studies
Observational Studies
Cohort, case-control, and cross-sectional designs
Survey Research
Precision-based sample size for proportions
Pre-Clinical Studies
Animal and laboratory experiments
Ready to Scientifically Determine Your Sample Size?
Our power analysis ensures your study is neither under- nor over-powered.
What Our Clients Say
"Michael's work was incredible. He explained the complex nature of my experiment and provided a detailed sample size and power analysis report that was approved without ammedments by my supervisor and the commettee."
David
USA"Michael's work was very good. He provided a sophisticated power analysis for my proposed longitudinal study, which made by research project to appear well-designed, feasible, and an efficient use of resources."
Emma
Sweden"Michael's work on sample size and power calculations was great. We achieved not only statistical validity, but also ethical and financial approval."
