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HS 8 Test Construction
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Protector model (laten traits model - IRF threshold model)
Protector model (laten traits model - IRF threshold model)
Guttman model is niet realistisch want alle responspatronen komen voor in empirische data. Dus probabilistische versie (Protector model) van het deterministische Guttman model. Threshold functie, maar neemt niet waarde 0 of 1 aan, alleen alles ertussen. (1-m voor groter dan waarde b en m indien lager of gelijk aan waarde b). Waarde m (by mistake - error propability)) is altijd groter dan nul (dus low-trait participanten altijd kans om correct antwoord te geven), en lager dan 0,5. En m-1 is altijd kleiner dan 1 (dus high-trait participanten altijd kans op incorrect antwoord geven). Non-decreasing. Kans op correct item is 1-m voor latent trait boven treshold.
Mokkens monotone homogeneity model
Mokkens monotone homogeneity model
Monotoon, non-decreasing - altijd stijgt of gelijk blijft bij hogere latent trait - function van latent trait, tussen 0 en 1 - IRFs kunnen kruisen (dus geen rank mogelijk). Niet gekarakteriseerd door parameters.
Betekenis waarde H
Betekenis waarde H
1. H kleiner of gelijk aan 0.3 en kleiner dan 0.4 - zwak.
2. H gelijk aan 0.4 en kleiner dan 0.5 - gemiddeld.
3. H groter of gelijk aan 0.5 - sterk.
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