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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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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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