NOTE: This video has been updated and revised. The new version can be found here: https://www.youtube.com/watch?v=_L39rN6gz7Y This StatQuest focuses on the machine learning topic "Decision Trees". Decision trees are a simple way to convert a table of data that you have sitting around your desk into a means to predict and classify new data as it comes. There is a minor error at 12:43: The Gini Impurity for Chest Pain should be 0.19. There is another minor error at 14:39: We should plug in 0.375 instead of 0.336. 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 (USA/Europe): https://teespring.com/stores/statquest (everywhere): https://www.redbubble.com/people/starmer/works/40421224-statquest-double-bam?asc=u&p=t-shirt ...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 0:15 How to use decision trees to make decisions 1:36 Descriptions of decision trees and their parts 3:29 How to build a decision tree 7:06 Calculating Gini Impurity 13:59 Numeric and continuous variables 15:31 Ranked data 16:08 Multiple choice data #statquest #decisiontree #ML