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Regression analysis is a form of predictive modelling technique which investigates the relationship between a dependent (target) and independent variable (s) (predictor). This technique is used for forecasting, time series modelling and finding the causal effect relationship between the variables.
Answer Wiki. Regression is the process of fitting an (approximated) continuous function to a set of independent data points. This is useful for approximating dependent values (y) for independent values (x) that aren't present in the data set. You can even use this regression curve to predict values of y for x's that are outside of the range of the current dataset (extrapolation).