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xluo11 / xxIRT

R package for item response theory
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The estimation algorithm of IRT model #2

Closed badbye closed 7 years ago

badbye commented 7 years ago

I have found a Python package pyirt , which is using the EM algorithm to do the estimation. Here is the reference: http://www.openirt.com/b-a-h/papers/note9801.pdf

I did not find the reference in your code implementation. According to the code, seems xxIRT and pyirt are using different algorithms. Which one is more popular and robust?

xluo11 commented 7 years ago

This is my reference: https://www.amazon.com/Item-Response-Theory-Estimation-Techniques/dp/0824758250. To compare two implementations, you can simply conduct a simulation study (see examples in the Parameter Estimation section).

badbye commented 7 years ago

Hmmm, this material is not easy to access. Thank you anyway.