STAB22H3 Lecture Notes - Lecture 5: Linear Regression, Regression Analysis
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STAB22H3 Full Course Notes
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No regression analysis is complete without a display of the residuals to check that the linear model is reasonable. Residuals often reveal subtleties that were not clear from a plot of the original data. Sometimes they reveal violations of the regression conditions that require our attention. Any point that stands away from the others can be called an outlier and deserves your special attention. Outlying points can strongly influence a regression, even a single point far from the body of the data can dominate the analysis. High leverage point: a data point that has an x-value far from the mean of the x-values.
