Cross Validation: A Simple Explanation using K-Nearest Neighbours

Still confused about cross validation? Here's another way to think about it. Refs: Data Science Textbook: https://datasciencebook.ca/ Time Stamps: 0:00- Intro 1:02 - Training/Testing Split 2:20 - What is Tuning? 2:48 - Using the Testing Data Set to Choose K? 5:09 - The Validation Set (A Second Split) 6:37 - Using the Validation Set to Choose K 7:30 - Cross Validation 10:38 - The Entire Model Fitting and Tuning Summary 11:56 - Wrap-up