What is Polynomial Regression ? - Deepstash

# What is Polynomial Regression ?

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## Polynomial regression

• Polynomials are algebraic expressions consisting of variables and coefficients.
• Polynomial regressions are the most used in machine learning.

Polynomial regression is a unique case of linear regression:

• You fit a polynomial equation on the data with a curvilinear relationship between the independent variable x and the dependent variable y.
• It is modelled as an nth degree polynomial.

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## Where linear regression fails

In linear regression, we use a single line to predict our data using the line equation. However, we need to use polynomial regression when our data is not a linear dataset but a kind of polynomial curve.

In that case, we need to use a polynomial curve to predict the value the curve can be increasing or decreasing.

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