In view of the coronavirus pandemic, we are making LIVE CLASSES and VIDEO CLASSES completely FREE to prevent interruption in studies
Home > Formulas > Maths Formulas > R Squared Formula
Maths Formulas

R Squared Formula

We also know R-squared as the coefficient of determination. It is the statistical measurement of the correlation between an investment’s performance and a specific benchmark index. So, in another way, it shows what degree a stock or portfolio’s performance can be attributed to a benchmark index. In this topic, we will discuss the R Squared formula with examples. Let us learn it!

R Squared Formula

What Is R-Squared?

R-squared \((R^2)\) is popular as a statistical measure that represents the proportion of the variance for a dependent variable. It explained an independent variable or variables in a regression model. Whereas correlation explains the strength of the relationship between two variables independent and dependent variables. R-squared explains to what extent the variance of one variable explains the variance of the second one. So, if the \(R^2\) value of a model is 0.50, then approximately half of the observed variation will be explained by its inputs.

In investing, R-squared is generally interpreted as the percentage of some fund or security movements which can be explained by movements in the benchmark index. For example, an R-squared for fixed-income security versus some specific bond index will identify the security’s proportion of price movement since it is predictable as per the price movement of the index. The same can be applied to the stock versus the S & P 500 index, or any other related relevant index.

The Formula for R-Squared :

R Squared is also known as the coefficient of determination and represented by R² or r² and pronounced as R Squared- is the number indicating the variance in the dependent variable that is predicted from the independent variable. It is a statistical model used for future prediction and outcomes, and it is regarded as testing of hypothesis. The linear relation between the dependent and independent variables is referred through some formula.

R Squared Formula

Here we can see how to calculate and interpret such coefficients for ordinal and interval level scales. Methods of computation will summarize the relationship between two variables in a single number which is known as the R-squared coefficient. The coefficient is usually shown by the symbol R^2 and it ranges from -1 to +1.

Following is the Formula for R Squared:

\(\large R^{2}=\frac{ N\sum xy-\sum x \sum y}{\sqrt{\left[ N\sum x^{2}-\left(\sum x\right)^{2}\right]\left[ N\sum y^{2}-\left(\sum y\right)^{2}\right]}}\)

  • N = No of scores given
  • \(\Sigma XY\) = Sum of paired product
  • \(\Sigma X\) = X score sum
  • \(\Sigma Y\) = Y score sum
  • \(\Sigma X^2\) = square of X score sum
  • \(\Sigma Y^2\) = square of Y score sum

Solved Examples for R Squared Formula

Q.1: Calculate the correlation coefficient for the following data.

X = 4, 8 ,12, 16 and

Y = 5, 10, 15, 20.


Given variables are,

X = 4, 8 ,12, 16     and

Y = 5, 10, 15, 20

To find the linear coefficient of given data, let us construct a table to get the required values of the formula.

X Y \(X^2\) \(Y^2\) XY
4 5 16 25 20
8 10 64 100 80
12 15 144 225 180
16 20 256 400 320
\(\sum X = 40\) \(\sum Y =50\) \(\sum X^2= 480\) \(\sum Y^2 = 750\) \(\sum XY= 600\)


\(R^2 = \frac{N\times \sum{XY}-(\sum{X}\sum{Y})}{\sqrt{ [N\sum{x^2}-(\sum{x})^2 ][N \sum{y^2}-(\sum{y})^2 }]}\)

Putting all the values,

\(R^2 = \frac{4\times 600-(40\times 50)}{\sqrt{ [4\times 480-(40)^2 ][4\times  750-(50)^2 }]}\)

Solving we get

\(R^2 = \frac{400}{17.89\times22.36}\)

\(= \frac{400}{400}\)

= 1

Therefore correlation coefficient is 1.

Share with friends

Customize your course in 30 seconds

Which class are you in?
Get ready for all-new Live Classes!
Now learn Live with India's best teachers. Join courses with the best schedule and enjoy fun and interactive classes.
Ashhar Firdausi
IIT Roorkee
Dr. Nazma Shaik
Gaurav Tiwari
Get Started

Leave a Reply

Notify of

Stuck with a

Question Mark?

Have a doubt at 3 am? Our experts are available 24x7. Connect with a tutor instantly and get your concepts cleared in less than 3 steps.
toppr Code

chance to win a

study tour

Download the App

Watch lectures, practise questions and take tests on the go.

Get Question Papers of Last 10 Years

Which class are you in?
No thanks.