comparing rasch.jml to winsteps

alexanderrobitzsch / sirt

Supplementary Item Response Theory Models

https://alexanderrobitzsch.github.io/sirt/

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comparing rasch.jml to winsteps #3

Closed thoughtafter closed 6 years ago

thoughtafter commented 6 years ago

I'm developing software for a client who want IRT item difficulties to match Winsteps. My understanding is that Winsteps centers item difficulty at 0. Is there a way to use rasch.jml to get numbers similar to Winsteps?

alexanderrobitzsch commented 6 years ago

I added the argument center in the rasch.jml() function. It is included in the dev version sirt 3.0-12.