# Nonlinear Regression

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## Definition of 'Nonlinear Regression'

Nonlinear regression is a statistical technique that is used to model the relationship between a dependent variable and one or more independent variables when the relationship is not linear. In other words, nonlinear regression is used to model relationships that are not straight lines.

There are a number of different types of nonlinear regression models, each of which is used to model a different type of relationship. Some of the most common types of nonlinear regression models include:

* **Polynomial regression** models are used to model relationships that are curved. The degree of the polynomial determines the shape of the curve. For example, a linear regression model is a polynomial regression model of degree 1, a quadratic regression model is a polynomial regression model of degree 2, and so on.
* **Logistic regression** models are used to model relationships that are sigmoidal. A sigmoidal curve is a curve that has a "S" shape. Logistic regression models are often used to model the probability of an event occurring.
* **Exponential regression** models are used to model relationships that are exponential. An exponential curve is a curve that grows or decays at a constant rate. Exponential regression models are often used to model the growth of a population or the decay of a radioactive substance.

Nonlinear regression models can be used to solve a variety of problems in finance. For example, nonlinear regression models can be used to:

* Predict the price of a stock
* Forecast the demand for a product
* Estimate the cost of a project
* Determine the optimal mix of inputs for a production process

Nonlinear regression models are a powerful tool for financial analysis. However, it is important to note that nonlinear regression models can be more difficult to fit and interpret than linear regression models. As a result, it is important to use nonlinear regression models only when the relationship between the dependent variable and the independent variables is truly nonlinear.

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