What is cross validation? Why we need it? Leave one out and k-fold cross validation

Описание к видео What is cross validation? Why we need it? Leave one out and k-fold cross validation

This material is also used as a part of my statistical learning course.

In this video, you will learn the basics about training and testing data, training and testing errors.
1. Why do we need cross-validations?
2. Two methods of cross-validations:
a. leave one out
b. k-fold.

I'll make another video using a real-life data example to explain how to do cross-validations in R.

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