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Dichotomous JML issues #83

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eribean opened this issue Dec 28, 2020 · 2 comments · Fixed by #84
Closed

Dichotomous JML issues #83

eribean opened this issue Dec 28, 2020 · 2 comments · Fixed by #84
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eribean commented Dec 28, 2020

While working on #30, noticed Joint Maximum Likelihood had large errors, need to investigate and fix.
@eribean eribean self-assigned this Dec 29, 2020
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eribean commented Dec 29, 2020

The 2PL and GRM JML give different answers. This shouldn't be the case when the input is dichotomous. GRM appears to be closer to truth, which support what was found in #30.

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eribean commented Dec 30, 2020

The issue was in trim_response_set. The invalide_response was not honored. Added logic to look for it, errors are much lower in rasch/onepl/twopl. Noticed that MAP is much better and consistent. Explore this.

@eribean eribean mentioned this issue Dec 30, 2020
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Fixxed bug in JML where INVALID_RESPONSE was not honored during masking. eribean/girth
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