1 / 11

Playing the y-model

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.

ravi
Download Presentation

Playing the y-model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Playing the y-model XU Kun 24 Nov 2011

  2. 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

  3. 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

  4. 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

  5. Bias of Item Difficulty

  6. RMSE of Item Difficulty

  7. Bias of Student Ability

  8. RMSE of Student Ability

  9. Outfit Standardized t of Item

  10. Outfit Standardized t of Student

More Related