# Regression Analysis and Curve Fitting

## Abstract

Many applications in hydrology and hydroclimatology deal with studying the relationship between the associated variables. The target variable is known as dependent variable, whereas other variables are known as independent variables. In statistics, the procedure of developing such relationship between dependent and independent variables is called regression analysis. The fitted statistical model is termed as regression model. Such models can be used for assessment of the dependent variable, knowing the independent variables. There are different types of regression models, and every regression model consists of some mathematical formulation with parameters to relate independent variables to dependent variable. All these types of regression models are discussed in this chapter.