jamovi

I appreciate your help. Thank you very much.

I'll send the file soon.

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

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

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

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