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Summary

Samenvatting Stappenplan voor de analyses in SPSS voor VOS

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Een stappenplan voor de uitvoering van iedere analyse in SPSS. Per onderwerp uitgelegd welke stappen ondernomen moeten worden en welke informatie waar te vinden is.

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Multipele regressie
Voorwaarden:
1. Afhankelijke variabele moet minimaal interval meetniveau zijn en onafhankelijke
minimaal interval meetniveau of dichotoom.
2. Er moet een lineair verband zijn (onderzoeken door spreidingsdiagram)
3. Afwezigheid van uitschieters (kijken naar spreidingsdiagram of residuals statistics)

Correlatie tussen variabelen bepalen:
- Analyze > correlate > bivariate

Multipele regressieanalyse uitvoeren:
- Analyze > regression > linear
- Save > standardized residuals > Mahalanobis > Cook’s distances
- Statistics > collineairity diagnostics
- Plots > *Zpred op de X-as en *Zresid op de Y-as
- Plots > histogram

Controleren op uitschieters in de regressieanalyse:
- Bekijk tabel residuals statistics
- Min. en max. waarde van standardized residuals: tussen -3,3 en +3,3
- Min. en max. waarde van Mahalanobis: lager dan 10 + (2 x aantal onafh. Variabelen)
- Min. en max. waarde van Cook’s: lager dan 1

Multicollineariteit vaststellen in de regressieanalyse:
- Bekijk tabel coefficients
- Waarde tolerance kleiner dan .2 > probleem mogelijk
- Waarde tolerance kleiner dan .1 > probleem
- Waarde VIF groter dan 10 > probleem

Hiërarchische regressieanalyse uitvoeren:
- Analyze > regression > linear
- Block 1 of 1 > next > nieuwe variabelen invullen
- Statistics > R squared change

R bij model summary is de multipele correlatiecoëfficiënt
R^2 bij model summary is de verklaarde variantie van de steekproef
Adjusted R square bij de model summary is de geschatte variantie van de populatie

Meerweg ANOVA
Meerweg ANOVA uitvoeren:
- Analyze > general linear model > univariate
- Variabelen op de juiste plek
- Plots > factor met de meeste groepen op horizontal, factor met minste groepen op
seperate lines > add
- Post hoc > toetsing voor factoren met meer dan 2 groepen (Bonferroni)

Connected book
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Publisher: november 2017 ISBN: 9781526419521 Edition: 5

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