R Squared

Introduction

This is all about R² and R.

What is the difference

Well I guess R² = R squared. R² is the variance between a dependent variable and an independent variable in terms of percentage. Therefore 0.4 R² = 40% and R = 0.2. I guess I agree that using R² does provide an easier way to understand what you mean however there is no sign on R².

Formula for R²

This is given by

Looking at variance we calculate the differences from the mean like below. Note this shows a population and we should divide by n-1 not n but I liked the graphic.