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Samenvatting stappenplan shapiro wilk test SPSS

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Cursus inleiding in de statistiek: stappenplan shapiro wilk test SPSS Met screenshots van syntax en output

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Uploaded on
January 16, 2023
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Written in
2020/2021
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SHAPIRO-WILK-TEST ➔ normaliteitstoets

➔ test om voorwaarde te controleren om dan te zien welke volgende test gebruikt kan worden

• continue variabele ➔ is die Gaussiaans verdeeld
• H0: onderliggende verdeling van de variabele is normaalverdeeld
• H1: onderliggende verdeling van de variabele is niet normaalverdeeld
• niet manueel uitvoeren; enkel via SPSS
• ALTIJD laten samengaan met gepaste grafische voorstelling
• Rapportering enkel in syntax!
o in de syntax kan men dit met eigen woorden vermelden



Normaalverdeling nagaan ➔ Q Q-plot opstellen

1. Analyse
2. Descriptive statistics
3. Explore
4. Plots: normality plots with tests



Output interpreteren:

Sig = p-waarde

Normaalverdeeld wnr p-waarde > 0,05 ➔ nulhypothese aanvaarden

Scheefverdeeld wnr p-waarde < 0,05 ➔ nulhypothese verwerpen + alternatieve hypothese
aanvaarden

Df = vrijheidsgraden = n

Centraal Limiet Theorema CLT = n moet groot genoeg zijn ➔ vanaf n=30 kunnen we Gaussiaanse
verdeling gaan inroepen

• Wnr volgens Shapiro Wilk scheef verdeeld MAAR n veel groter dan 30
➔ toch normaalverdeeld en nulhypothese aanvaarden

Syntax:




➔ rapportering in syntax in eigen woorden
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