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StatQuest: Principal Component Analysis (PCA), Step-by-Step Analytics Table
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About StatQuest: Principal Component Analysis (PCA), Step-by-Step
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Principal Component Analysis, is one of the most useful data analysis and machine learning methods out there. It can be used to identify patterns in highly complex datasets and it can tell you what variables in your data are the most important. Lastly, it can tell you how accurate your new understanding of the data actually is. In this video, I go one step at a time through PCA, and the method used to solve it, Singular Value Decomposition. I take it nice and slowly so that the simplicity of the method is revealed and clearly explained. If you are interested in doing PCA in R see: https://youtu.be/0Jp4gsfOLMs If you are interested in learning more about how to determine the number of principal components, see: https://youtu.be/oRvgq966yZg For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider... Patreon: https://www.patreon.com/statquest ...or... YouTube Membership: https://www.youtube.com/channel/UCtYLUTtgS3k1Fg4y5tAhLbw/join ...buying one of my books, a study guide, a t-shirt or hoodie, or a song from the StatQuest store... https://statquest.org/statquest-store/ ...or just donating to StatQuest! https://www.paypal.me/statquest Lastly, if you want to keep up with me as I research and create new StatQuests, follow me on twitter: https://twitter.com/joshuastarmer 0:00 Awesome song and introduction 0:30 Conceptual motivation for PCA 3:23 PCA worked out for 2-Dimensional data 5:03 Finding PC1 12:08 Singular vector/value, Eigenvector/value and loading scores defined 12:56 Finding PC2 14:14 Drawing the PCA graph 15:03 Calculating percent variation for each PC and scree plot 16:30 PCA worked out for 3-Dimensional data #statquest #PCA #ML
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