Linear regression
Let's begin our triple W session with linear regression first.
What is linear regression?
It is the traditional and most-used regression analysis. It is studied rigorously and used widely for practical purposes. Linear regression is a method for determining the relationship between a dependent variable (y) and one or more independent variables (x). This derived relationship can be used to predict an unexplained y from observed x's. Mathematically, if x is an independent variable (commonly known as the predictor) and y is a dependent variable (also known as the target), the relationship is expressed as follows:

Where m is the slope of line, b is the intercept of the best-fit regression line, and ε is the error term that is a deviation of the actual and predicted values.
This is the equation for simple linear regression, as it involves only one predictor (x) and one target (y). When there are multiple predictors involved to predict a target, it is known as multiple linear regression...