Use matrix scatter plot and visually decide if a linear model is appropriate 2. If the relation
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Use matrix scatter plot and visually decide if a linear model is appropriate
2. If the relation is not linear, transform the data accordingly.
- Try logarithm, exponential, square root, square, etc., for Y and/or X until you see a linear relation. You only need to report what is the transformation chosen,
3.Use an OLS model for the original and transformed data if required.
- Evaluate if the OLS assumptions are met: normality of errors centered around zero, equal variance, etc..., for the original data and transformed data if appropriate.
- Comment how the transformation impacted the different assumptions. (This should be done only by looking at the output diagnostic charts created by the software)
- If datasets have outliers, remove the outliers and see the effect in the model (slope, intercept and R-square)
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Related Book For
Statistics Informed Decisions Using Data
ISBN: 9780134133539
5th Edition
Authors: Michael Sullivan III
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