Exponential regression calculator Exponential regression

Exponential regression calculator


Table of Contents

What is Exponential Regression?

The Exponential regression is used to find an exponential curve based on your data and which best suits the data you are studying. There are various regressions which helps us draw a line (linear regression), parabola (quadratic regression) or a cubic curve (cubic regression) and Exponential regression is similar to those methods. 

There are some datasets that grow rapidly at first then slows down, or grows slowly at first then start accelerating rapidly. In such cases, there is not line or a parabola that can depict the data perfectly and here, Exponential regression can be a best fit. Some of the examples of such data can be and investment growth, temperatures, etc. 

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Exponential regression model

 Exponential regression too has a response variable (y) which is observed as a count and an explanatory variable (x). The exponential regression equation reads y = a * bˣ, where a ≠ 0 and b > 0b ≠ 1. The coefficients a and b are to be chosen in such a way that they correspond to the Exponential regression curve that is a best fit for your dataset (x₁, y₁), …, (xₙ, yₙ)

  • a is the predicted value for x=0, the Exponential regression model
  • If b>1 the exponential fit depicts an exponential growth
  • If 0<b>1 the exponential fit depicts an exponential decay. 
Exponential regression calculator Exponential regression

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Calculating Exponential regression formula

As we learned the exponential fit equation, we will see how to calculate exponential regression for the collected da in this section.

  • Transform our data to allow a linear model.
  • Determine that linear model, e.g., with the method of least squares.
  • Transform the data along with the model back to the original form.

Exponential regression formula for the data (x, y) is:

y = exp(c) * exp(m * x)

Where m is the slope and c is the intercept of the linear regression model fitted to the data (x, ln(y)). See the next section to check the details of the derivation.

Standards for interpreting correlation coefficient r:
  0.7|r|1        strong correlation
  0.4|r|0.7    moderate correlation
  0.2|r|0.4    weak correlation
  0|r|0.2        no correlation

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Example of Exponential regression

There are various Exponential regression online calculators also that minimize your efforts and also help you to get your exponential fit for the data. 

In this example, let’s take some random coo-ordinates: (0,3),(1,7),(2,10),(3,24),(4,50),(5,95)

Now, you can enter these x-coordinates and y-coordinates in your Exponential regression calculator and.  

The equation of the function that best approximates the points is y=3.0465(1.988)xy=3.0465(1.988)x

And when you plot the graph for the above data, it will look something like this:

Exponential regression calculator Exponential regression

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Hindol Basu 
GM, Voxco Intelligence


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