Frequently asked questions (FAQ)
Weet je niet hoe je een regressie analyse moet doen? Ben je benieuwd hoe je een statistische test interpreteert? Of heb je een andere vraag over Statistiek of Methodologie? Bekijk dan eerst deze frequently asked questions (FAQ) om je vraag op te lossen. Kom je er nog steeds niet uit? Dan kun je contact opnemen met het Statistisch Methodologisch Adviespunt (SMAP).
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Linear regression
- I want to perform a regression analysis. Do all my variables have to be continuous (quantitative)?
- My dependent variable is ordinal: measured on a Likert scale. Does this count as continuous?
- I want to do a multiple regression analysis. Which assumptions do I need to check?
- What are residual values?
- How and why do I check independence of the data?
- What should I do if independence of the data is violated?
- How and why do I check the assumptions of normality, homoscedasticity and linearity?
- What if normality is violated?
- I have some extreme values in my data. What do I do now?
- What if linearity is violated?
- What if homoscedasticity is violated?
- How do I check multicollinearity?
- How do I deal with multicollinearity?
- How can I check and avoid influential cases?
- When and how do I control for some predictors in a regression analysis?
Mediation analysis
- My research question is about mediation. Which analysis should I use?
- What is PROCESS and how do I get started?
- How do I perform a simple mediation analysis via PROCESS?
- Which options should I choose in Process?
- How do I interpret output of a simple mediation analysis with PROCESS?
- How do I report the results from my mediation analysis?
- I want to do more than simple mediation. How do I do that?
- Process doesn’t work! What did I do wrong?
- Where can I find more information on PROCESS?
- How do I do mediation analysis via MEMORE (within-subject design)?
- What are the assumptions for the mediation analyses done in PROCESS?
- How do I perform a power analysis for a mediation analysis?