Process of estimating relationship between a dependent variable and
other independent variables.
Based on number of independent variables it could be of 2 Types:
1. Simple regression : Use one independent variable to produce estimation for the dependent variable
2. Multiple regression : Use multiple independent variables to produce estimation for the dependent variable
Based on linearity (or linear correlation) it could be of 2 Types:
1. Linear: when nature of relationship between dependent and independent variables could be explained by straight line
2. Non-linear: when nature of relationship between dependent and independent variables do not follow straight line