In this video, I will give you an easy and practical explanation of Principal Component Analysis (PCA) and how to use it to visualise biological datasets.
You can also find a step by step explanation here: https://biostatsquid.com/a-simple-explanation-of-pca/
Hope you like it!
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More PCA resources:
A more deep explanation of the math behind PCA, without math!
https://towardsdatascience.com/principal-component-analysis-pca-explained-visually-with-zero-math-1cbf392b9e7d
I also really love this explanation from StatQuest!
https://www.youtube.com/watch?v=FgakZw6K1QQ