REGRESSION ANALYSIS: In statistics, regression
analysis includes any techniques for modeling and
analyzing several variables, when the focus is on the
relationship between a dependent variable and one or more
independent variables. More specifically, regression
analysis helps one understand how the typical value of the
dependent variable changes when any one of the
independent variables is varied, while the other
independent variables are held fixed. Most commonly,
regression analysis estimates the conditional expectation of
the dependent variable given the independent variables
that is, the average value of the dependent variable when
the independent variables are held fixed.