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HS 14 Test Construction
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Test informatie (IRT)
Test informatie (IRT)
Parametrische latent trait modellen bepalen precisie van de latent trait schattingen door naar de test informatie (som test informatie waarden) te kijken. Informatie op een latent trait waarde is het omgekeerde van de within-person variantie.
- Hoge informatie waarde (schatting latent trait waarde precies - kleine within-person variantie).
- Lage informatie waarde (schatting latent trait waarde niet precies - hoge within-person variantie).
Door local independence: som van de 4 item naar 1 test informatie.
Moeilijkheden optimal test design
Moeilijkheden optimal test design
1. Onmogelijk optimaal design te vinden door te kijken naar item (target) informatie functie.
2. Zorgt voor beperkingen op een test die moeten worden gemaakt uit een pool van items (vb. lengte, geen overlap).
3. Kan niet altijd worden bereikt onder beperkingen.
- Dus lineaire programmering methoden nodig.
Invloed administration mode
Invloed administration mode
Invloed administration mode (paper-pencil of CAT) vaak weinig effect voor dichotome cognitieve testen en ordinale-polytome voorkeurstesten, maar CAT is efficiënter (maar helft van de items nodig of dezelfde precisie te krijgen bij het schatten van verborgen abilities en 1/3 van de items bij het schatten van verborgen preference).
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