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Samenvatting stappenplan enkelvoudige wilcoxon test SPSS
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Cursus inleiding in de statistiek: stappenplan enkelvoudige wilcoxon test SPSS Met screenshots van syntax en output
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ENKELVOUDIGE WILCOXON TEST• Eén groepen
• Continue variabele
• Niet-parametrisch
• Wnr scheef verdeeld
• Methode:
o Een One sample Wilcoxon Signed-Ranks werd uitgevoerd om na te gaan of de tijd
nodig om de s correct te leren uitspreken verschillend was van 4 maand. Er werd
tweezijdig getest met alpha = 0.05.
• Resultaten:
o Men heeft meer tijd nodig [Mediaan (IQR): 6 maand (5-10 maand)] dan de
vooropgestelde 4 maand om de s correct te leren uitspreken (Z =43,000; p= 0.015)
o Z=zwaarde, p=pwaarde
• Grafisch voorstellen
Voorwaarde 1: normaliteit nagaan ➔ Q Q-plot
1. Analyse
2. Descriptive statistics
3. Explore
4. Plots: normality plots with tests
➔ wnr normaal verdeeld?
• Shapiro Wilk
o Normaalverdeeld wnr p-waarde > 0,05 ➔ nulhypothese aanvaarden
o Scheefverdeeld wnr p-waarde < 0,05 ➔ nulhypothese verwerpen + alternatieve
hypothese aanvaarden
• CLT:
o Wnr volgens Shapiro Wilk scheef verdeeld MAAR n veel groter dan 30
o ➔ toch normaalverdeeld en nulhypothese aanvaarden
➔ SCHEEF verdeeld voor deze test
Enkelvoudige wilcoxon test
1. Analyse
2. Nonparametric tests
3. One sample
4. Fields: variabele
5. Setting:
a. Customize tests
b. Compare mediant o hypothesized (Wilcoxon)
c. Mediaan (referentiewaarde) ingeven
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