This is a follow-up video for StatQuest: Principal Component Analysis (PCA), Step-by-Step https://www.youtube.com/watch?v=FgakZw6K1QQ In it, I give practical advice about the need to scale your data, the need to center your data, and how many principal components you should expect to get. If you are interested in doing PCA in R see: https://www.youtube.com/watch?v=0Jp4gsfOLMs 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... Buying The StatQuest Illustrated Guide to Machine Learning!!! PDF - https://statquest.gumroad.com/l/wvtmc Paperback - https://www.amazon.com/dp/B09ZCKR4H6 Kindle eBook - https://www.amazon.com/dp/B09ZG79HXC Patreon: https://www.patreon.com/statquest ...or... YouTube Membership: null ...a cool StatQuest t-shirt or sweatshirt: null ...buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/ ...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 0:47 Make sure the data are on the same scale 2:53 Make sure the data are centered 3:30 How to determine the number of principal components #statquest #PCA #ML