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SA-EP8-The Friedman Test [ ENGLISH ]

SA-EP8-The Friedman Test [ ENGLISH ]

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 🎙️ Episode Title: The Friedman Test – Ranking Repeated Measures with Confidence 🔍 Episode Description: Welcome to another episode of “Pal Talk – Statistics”, the show where complex concepts are simplified with clarity and confidence! In today’s episode, we dive into a non-parametric test that’s perfect for repeated measures or matched group comparisons — the Friedman Test. Ever wondered how to compare three or more related groups without assuming normality? That’s where the Friedman Test steps in — a solid alternative to repeated-measures ANOVA, especially when your data doesn't play by the normal distribution rules. In this episode, we explore: ✅ What is the Friedman Test? The Friedman Test is a non-parametric test used when you want to compare three or more related or matched groups — such as when the same participants are tested under different conditions or over time. It works on ranked data, making it robust against outliers and non-normal distributions. ✅ When to Use It? You’ll find the Friedman Test incredibly useful when: You have repeated observations on the same subjects Your data is ordinal, not normally distributed, or contains outliers You want an alternative to repeated-measures ANOVA ✅ How the Test Works – Step-by-Step Set up your null and alternative hypotheses Rank the values within each row (subject) Calculate the Friedman test statistic Compare the result to the chi-square distribution to determine significance We walk you through each step with an easy, real-world example — such as measuring reaction times of students across three different study techniques. ✅ Assumptions of the Friedman Test We cover the essential assumptions: Data must come from related samples (repeated or matched groups) Ordinal or continuous data Same number of observations per group ✅ What Happens After a Significant Result? If your Friedman Test result is significant, what’s next? We discuss post hoc analysis, like the Wilcoxon Signed-Rank Test with Bonferroni correction, to pinpoint where differences lie. ✅ Real-World Applications Medical trials comparing pain levels across treatments in the same patients Comparing productivity of employees across different work environments Measuring student satisfaction after three different learning modules ✅ Friedman Test vs Repeated-Measures ANOVA We compare both methods and help you understand when to use one over the other — especially when your data doesn’t meet parametric assumptions. 👥 Hosts: Speaker 1 (Male): A statistician who brings research techniques to life. Speaker 2 (Female): A curious learner making sure every listener stays on track. 🎧 Whether you're in psychology, medicine, education, or behavioral science — this episode will empower you to analyze related group comparisons confidently, even when your data is far from perfect. 📌 Coming Soon on “Pal Talk – Statistics” Cochran’s Q Test Wilcoxon Signed-Rank Test Non-Parametric Effect Sizes Designing Experiments with Repeated Measures 💡 Enjoying the series? Subscribe, share, and rate “Pal Talk – Statistics” to help us grow a global community of curious, data-driven minds. 🎓 Pal Talk – Where Data Talks.

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