A researcher collected data on Y and four X-variables: X1, X2, X3, X4, and he wants to obtain a regression model. Howeve

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A Researcher Collected Data On Y And Four X Variables X1 X2 X3 X4 And He Wants To Obtain A Regression Model Howeve 1 (347.55 KiB) Viewed 35 times

A researcher collected data on Y and four X-variables: X1, X2, X3, X4, and he wants to obtain a regression model. However, he is not sure if all the four X-variables should be included in the model. He provides you with the information shown below, namely, the SSR obtained when Y was regressed on each subset of X-variables. Also given: SST100, and the sample size is n = 12. Apply the Forward-Stepwise selection method, with α-to-enter = 0.05, to determine which X-variables should be in the regression model! State which variable entered first, which entered second, etc., then state the set of variables that were selected. Subset of variables SSR Subset of variables SSR X1 52 X1, X2, X3 80 X2 X1, X2, X4 83 X3 X1, X3 X4 76 X4 X2 X3 X4 82 X1, X2 X1 X2, X3, X4 84 X1, X3 X1, X4 X2, X3 X2, X4 X3, X4 N 00⁰ 48 54 36 75 69 76 74 78 72