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Samenvatting stappenplan kruskal-wallis test SPSS

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Cursus statistiek: stappenplan kruskal-wallis test SPSS Met screenshots van syntax en output

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KRUSKAL-WALLIS TEST

In plaats van ANOVA wanneer de Shapiro Wilk niet normaal verdeeld aantoond

Niet-parametrische test

Voorbeeldvraag: Is er verschil in geboortegewicht tussen de verschillende groepen van ligging bij
moeders die 3 keer of meer zijn bevallen én die niet geïnduceerd zijn?

• STAP 1: ALTIJD EERST CLEANEN!
• STAP 2: groepen maken! ➔ hier voor ligging
o frequentietabel
o Recode into different: groepen maken
▪ Sysmis blijft sysmis ➔ anders kan dit voor problemen zorgen!
o Variable labels
o Value labels
o Formats
o Controle frequentietabel
• Eventueel cases selecteren (data – select cases – if condition is satisfied)
o Zie codeboek
o Controle met frequencietabel
• STAP 3: Voorwaarde 1: normaliteit nagaan ➔ shapiro wilk
o Analyze
o Descriptive explore:
▪ Dependent list = geboortegewicht
▪ Factor list = ligging groepen
▪ Statistics afblijven
▪ Plots = normality with test
▪ Continue
▪ Paste
▪ Uitvoeren
o Interpretatie:
▪ Sig = p-waarde
▪ Normaalverdeeld wnr p-waarde > 0,05 ➔ nulhypothese aanvaarden
▪ Scheefverdeeld wnr p-waarde < 0,05 ➔ nulhypothese verwerpen +
alternatieve hypothese aanvaarden
o Centraal Limiet Theorema CLT = n moet groot genoeg zijn ➔ vanaf n=30 kunnen we
Gaussiaanse verdeling gaan inroepen = parametrisch
o ➔ wnr niet voldaan Kruskal-Wallis test!
• KRUSKAL-WALLIS TEST
o Analyze
o Nonparametric tests
o Independent samples
o Fields:
▪ Test fields = geboortegewicht
▪ Groups = ligging
o Paste
o Verschil = sig < 0,05
o Geen verschil = sig > 0,05

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