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Samenvatting statistiek: herhaling 2e bach

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Uitgebreide samenvatting van de lessenreeks statistiek: herhaling 2e bach

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  • January 16, 2023
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  • 2021/2022
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HERHALING 2E BACHELOR
Nominaal = categorie zonder rangorde

Ordinaal = rangorde

Continu = getalwaarde zoals lengte, gewicht ➔ scale



Datacleaning

• Stap 1: ga op zoek naar onmogelijke waarden
o Frequentieverdeling
• Stap 2: kopieer te cleanen variabele naar nieuwe variabele
o Recode into different variable
• Stap 3: controleer kopie
o Frequentieverdelingen vergelijken
• Stap 4: eigenlijke datacleaning
o Recode into same variable
• Stap 5: controleer datecleaning
o Frequentieverdeling



Gemiddelde (mean) ➔ standaarddeviatie SD

Mediaan (median) ➔ IQR en range

Variantie = mate waarin de waarden onderling verschillen



Grafische voorstelling:

• Is er een FIGUURBESCHRIVING die zelfbevattend is?
• Zijn de ASSEN benoemd? + eenheden wnr nodig
• Staat de outcome-variabele verticaal?
• Is de SCHAALINDELING duidelijk aangegeven?
• Als er een schaalonderbreking is, is die duidelijk weergegeven?



Wnr normaal verdeeld?

• Shapiro Wilk
o Normaalverdeeld = p > 0,05 ➔ parametrisch werken
▪ nulhypothese aanvaarden
o Scheefverdeeld = p > 0,05 ➔ niet-parametrisch werkens
▪ nulhypothese verwerpen + alternatieve hypothese aanvaarden
• Centraal Limiet Theorema CLT
o Wnr volgens Shapiro Wilk scheefverdeeld MAAR n > 30 ➔ normaalverdeeld!



Wnr de verkregen p-waarde KLEINER is dan het vooropgestelde significantieniveau (alpha = 0,05)

➔ dan wordt de nulhypothese verworpen

Wnr p kleiner is dan 0,001 vermelden we dit als p<0,001

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