Spiekbrief voor het tentamen van Experimenteel en Correlationeel onderzoek (ECO) (Leiden).
Alle nodige informatie met extra lege ruimte voor als je zelf er nog meer bij wil.
Overzichtelijk per onderwerp.
Getypt.
Hiermee heb ik een 9,5 voor de oefentoets gehaald.
Aannames controleren
1. Homogeniteit varianties: ANOVA tabel
a. Vuistregel: (grootste sd / kleinste sd) < 2 , of H0: alle αβij = 0; Ha : niet alle αβij = 0
b. Levene’s test: niet significant
2. Normaliteit residuen: Histogram of P-P/Q-Q-plot residuen
3. Onafhankelijkheid: Geen check
Source SS df MS F (dfeffect,
dfe)
A ∑𝑛𝑖 𝑎̂𝑖2 I–1 SSA / dfA MSA / MSe
→ omschrijven naar lineair contrast → c = k(k -1)/2
Lineair contrast: gemiddeldes met elkaar vergelijken → met αfam controleren of α’
𝜓 = 𝑎1 𝜇1 + 𝑎2 𝜇2 + ⋯ + 𝑎𝑘 𝜇𝑘 idd ongeveer 0.05 is
→ ai = contrastcoëfficiënt
Hypotheses: H0: ψ = 0 Ha: ψ ≠ 0
T-toets voor contrasten
𝑐
𝑡=
𝑆𝐸𝑐
→ df = N – I
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