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04_Chapter 04 - Click to edit Master subtitle style 4...

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Click to edit Master subtitle style Ch 1 4. Multiple Regression Analysis 11
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Ch 1 Decision Process 1. Research Objective 2. Research Design 3. Assumption Test 4. Estimating the Regression Model and Assessing Overall Fit 5. Interpretation 6. Validation 22
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Ch 1 1. Research Objective Purpose Predicting a single dependent variable from a regression variate Examining the effects of the independent variables in the regression variate 33
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Ch 1 1. Research Objective Variable Selection Strong theory Measurement Dependent: metric Independent: metric Sample Size Desired observation-to-variable ratio 5:1 44
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Ch 1 3. Assumption Test Linearity Partial regression plots Visual inspection Drop the variables that exhibit the 55 Not met Not met Not met
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Ch 1 3. Assumption Test Normality Normal probability plot Visual inspection No regression 66 Y ^ Y Not met
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Ch 1 77
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Ch 1 88 Analyze -> Regression -> Linear
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Ch 1 99 Choose X19 on the variable list, and click on the top arrow to enter X19 into “Dependent .”
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Ch 1 10 X19 is now in “Dependent .” Choose X6 from the variable list, and click on the second arrow from the top to enter X6 into “ Independent(s) .”
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Ch 1 11 Repeat the same procedure to enter X7 X18 into “ Independent(s) .” Click on Plots .
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Ch 1 12 Check Produce all partial plots and Normal probability plot . Click on Continue to close the window.
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Ch 1 13 Click on OK to run the assumption tests.
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Ch 1 14 Click on *zresid Normal P-P Plot on the left to inspect the normality plot. Does it look similar to the sample plot that does not met the normality assumption?
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