In the best subsets approach to regression analysis, if we start with 4 independent variables, a total of 33 different regression models will actually be computed for possible selection as the best model to use.

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In the best subsets approach, for $n$ independent variables, $2^n$ different regression models are computed. For 4 independent variables, $2^4 = 16$ different models are computed, not 33.

In the Best Subsets Approach to Regression Analysis, If We