Playing the y-model XU Kun 24 Nov 2011.

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Presentation transcript:

Playing the y-model XU Kun 24 Nov 2011

Outline Revisit the performance of tailored analysis procedure (Andrich, Marais & Humphry, 2011) Impact of guessing on person estimates Fit Statistics before and after controlling for guessing

Data Generation 500 students theta ~ N(-0.75, 1.22) 35 items b ~ U(-3.0, 3.0) c fixed to 1/7 y fixed to 15 100 replications

Analysis First analysis by Winsteps Export the item difficulty and student ability estimates Calculate the probability of each student on each item Prepare the data set for Tailored analysis Tailored analysis by Winsteps

Bias of Item Difficulty

RMSE of Item Difficulty

Bias of Student Ability

RMSE of Student Ability

Outfit Standardized t of Item

Outfit Standardized t of Student