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Parametric vs Non-Parametric statistical tests are explained, and how they relate to data type, distribution, and study design.
In this lecture on This Is Why, Dr. Busti brings the full biostatistics framework of the Statistical Analysis Plan (SAP) together—connecting data type, distribution, and study groups to the correct statistical analysis.
Understanding when to use parametric vs. nonparametric tests is critical for interpreting clinical research and avoiding common mistakes when evaluating data in evidence-based medicine (EBM).
This lecture reinforces how normal vs skewed data, outliers, and data classification influence statistical decision-making.
Topics Covered:
- Parametric vs nonparametric statistical tests
- Normal distribution vs non-normal data
- Role of data type in statistical analysis
- Impact of outliers and skewed data
- Nominal, ordinal, and continuous data review
- How distribution affects test selection
- Connecting data, groups, and statistical tests
- Interpreting how data is presented in research
- Clinical implications of incorrect statistical analysis
The goal = make medical education easy and clinically relevant.
Chapter Table of Contents
00:00 - Introduction
00:11 - Concept Overview
02:36 - Types of Data Variables
04:25 - Standard Statistical Tests
05:14 - Measures of Variability or Data Dispersion
07:03 - Chi-Squared vs. Fisher's Exact
08:45 - Non-Parametric Data
10:20 - Parametric Data
12:09 - Core Concepts
14:33 - Conclusion
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Speaker:
Anthony Busti, MD, PharmD, MSc, FAHA, FNLA, is a licensed healthcare professional and medical educator with over 30 years of experience in clinical practice and academic teaching. He has trained and practiced as a nurse, pharmacist, and physician, bringing a uniquely comprehensive perspective to patient care and medical education.
Dr. Busti is dedicated to advancing evidence-based medicine and helping clinicians understand the underlying “why” behind clinical decisions to improve patient outcomes.
About This Channel:
This content is created by Anthony Busti, MD, PharmD, MSc, FAHA, FNLA, a board-certified physician with training at Johns Hopkins School of Medicine and University of Oxford and a medical educator for healthcare professionals and students. All material is based on current medical literature and evidence-based guidelines that align with principles of evidence-based medicine (EBM) and Evidence-Based Healthcare (EBHC).
Disclaimer:
This content is for educational purposes only and is not medical advice. It does not replace individualized evaluation, diagnosis, or treatment. Always seek the advice of a qualified health provider with questions about a medical condition and never delay care because of educational content.
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