Alle formules die behoren bij psychometrie en besliskunde inclusief voorbeelden en uitleg
January 17, 2021
15
2020/2021
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psychometrie
besliskunde
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Formules psychometrie en besliskunde
Inhoud Formule Betekenis symbolen
Moeilijkheidsgraad (p) Ng = hoeveel mensen het goede antwoord gekozen
hebben.
N= hoeveel mensen in totaal.
Gecorrigeerde P = moeilijkheidsgraad
moeilijkheidsgraad (p’) a = aantal antwoordmogelijkheden
De kans dat het p – p’
antwoord goed is door
gokken.
Aantal personen dat het p – p’ * N
antwoord goed heeft
door gokken.
Aantal personen dat het p' * N
antwoord goed heeft op
basis van kennis.
Proportie fout (deel dat q= 1 - p
het verkeerde antwoord q+p=1
gekozen heeft)
Kwaliteit van de
afleiders (aantal dat
foute alternatief
gekozen heeft)
Itemvariantie S2 = p * (1-p)
Verklaarde itemvariantie Correlatie2
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