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Online Course

Nonparametric vs Parametric Tests of Location in Biomedical Research

24/07/2024 - 10:00 - 12:00

Course Overview:


This course addresses the debate on the applicability of parametric statistics to non-normal data distributions.

Empirical research suggests the Mann-Whitney test generally has greater power than the t-test except when data are normally distributed. 




Compare the relative power of Mann-Whitney and t-test or ANOVA/ANCOVA.


Examine the distribution of your primary endpoint.


Findings: The change between baseline and post-treatment data has often a normal distribution.

Generally, T-test or ANOVA/ANCOVA outperformed Mann-Whitney, particularly when log-transformed data were included.

Methods: Simulation studies were conducted using polynomials to model five non-normal distributions for baseline and post-treatment scores. The power of Mann-Whitney and T-test or ANOVA/ANCOVA was compared across various conditions, including sample size, correlation, and type of treatment effect.

Conclusion: ANCOVA is preferred for analyzing randomized trials with baseline and post-treatment measures, though in extreme cases, it may be less powerful than Mann-Whitney. In such instances, the treatment effect estimates from ANCOVA should be interpreted with caution.

Dr. Gil Harari, founder and CEO of Medistat, has been providing biostatistics services to top biomedical companies for 20 years. He holds a PhD in Epidemiology and Biostatistics from the University of Haifa and specializes in biostatistics for clinical trials. An expert in data mining, he lectures at Haifa University's School of Public Health and authored "Statistics in Medicine." Dr. Harari also serves as a statistical consultant, aiding companies with regulatory submissions.

About the Lecturer: Dr. Gil Harari

Who Should Attend?

This course is ideal for doctors, researchers, coordinators, research assistants, and anyone involved or interested in research and scientific writing.

Are the Lessons Recorded?

Yes, each session is recorded and made available to students immediately after the course concludes.

What Are the Payment Options?

You can pay for the course via PayPal or bank transfer.

Cost: 450 NIS

Register below to secure your spot in the course!

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