The multiple linear regression model
Fit a preliminary model. At this point, do not discuss the regression output.
Check model assumptions (e.g., constant variance, normality, and uncorrelated errors if
relevant) and diagnostics (outliers, leverage, influence, variance inflation); conduct
Modified-Levene test, test for normality, and Bonferroni outlier test.
IF you have adequate reason, you may remove outliers and re-do the preliminary
analysis.
Perform necessary transformations if necessary (check online) and present the
transformed model (remember to re-check model assumptions).
Clearly present your preliminary model that satisfies the model assumptions.
Explore the interaction terms
Explore interactions using partial regression plots.
Discuss the addition of possibly useful interaction terms.
Check correlations involving the added interaction terms before and after standardization.
