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Regression analysis:A collective name for techniques for the modeling and analysis of numerical data consisting of values of a dependent variable(also called response variableor measurement) and of one or more independent variables (aka. explanatory variablesor predictors)
The parameters are estimated so as to give a "best fit" of the data
Most commonly the best fit is evaluated by using the least squares method, but other criteria have also been used
Used for prediction (including forecasting of time-series data), inference, hypothesis testing, and modeling of causal relationships