Articles by Anastasios Markitsis

Multiple Regression (Part 3) Diagnostics

March 11, 2017 | Anastasios Markitsis

In the exercises below we cover some more material on multiple regression diagnostics in R. This includes added variable (partial-regression) plots, component+residual (partial-residual) plots, CERES plots, VIF values, tests for heteroscedasticity (nonconstant variance), tests for Normality, and a test for autocorrelation of residuals. These are perhaps not as common ... [Read more...]

Multiple Regression (Part 2) – Diagnostics

January 26, 2017 | Anastasios Markitsis

Multiple Regression is one of the most widely used methods in statistical modelling. However, despite its many benefits, it is oftentimes used without checking the underlying assumptions. This can lead to results which can be misleading or even completely wrong. Therefore, applying diagnostics to detect any strong violations of the ... [Read more...]

Multiple Regression (Part 1)

January 15, 2017 | Anastasios Markitsis

In the exercises below we cover some material on multiple regression in R. Answers to the exercises are available here. If you obtained a different (correct) answer than those listed on the solutions page, please feel free to post your answer as a comment on that page. We will be ... [Read more...]

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