Multiple linear regression II: model fit (R2, R2 adj), model comparisons, collinearity, dummy variables, including interaction
4 important questions on Multiple linear regression II: model fit (R2, R2 adj), model comparisons, collinearity, dummy variables, including interaction
Wat is the variance inflation factor VIF, en hoe kun je het interpreteren?
What are 3 precautions before fitting the model to prevent collinearity?
beforehand
- when two x-variables are expected to be strongly related, use only
one
of them
- inspect correlations among potential x-variables
What are 3 remedies for collinearity after fitting the model?
- inspect standard errors and VIFs
- fit models with subsets of x-variables as well and see what happens
- if necessary, use another method than least squares estimation
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What is a dummy variable in regression?
- 1 = aanwezigheid van een bepaalde categorie/eigenschap
- 0 = afwezigheid van die categorie/eigenschap
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
