jamovi

Hi

In the polytomous model (IRT), I need some guidance on finding the discrimination parameter (slope (a))- which indicates how well items discriminate between different levels of the underlying trait.

I developed a scale and would like to test it.

Thank you very much

Keren

Hi kerensm

you can check it by using Distractor analysis within snowIRT module.

Seol

Would you please explain how to do this and what result displays the parameter?

I did it. But I do not understand what parameter displays it. The infit for example parameter shows the difficulty.

You will find it by using example .omv file in the Data Library.

Thank you!
what does this error message mean: "data must be data frame or matrix"?

Would you send me .omv file that produced error at snow@cau.ac.kr?

I appreciate your help. Thank you very much.

I'll send the file soon.