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alexanderrobitzsch / sirt

Supplementary Item Response Theory Models
https://alexanderrobitzsch.github.io/sirt/
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invariance.alignment - Ordered categorical data (item threshold parameters) #26

Closed MitjaCernko closed 1 day ago

MitjaCernko commented 1 day ago

First of all, thank you for the wonderful work of making the alignment procedure more accessible within R!

I'm wondering how difficult would it be to implement the option to include item thresholds as parameters in addition to the item intercepts (relevant in the case of ordered categorical CFA)?

If not, any pointers as to how you would approach this would be greatly appreciated - the "Alignment" function from the "AlignLV" package supports this option, and it seems like a useful starting point...

alexanderrobitzsch commented 1 day ago

The thresholds can be defined as item intercepts and item loadings have just to be duplicated according to the number of thresholds per item.

MitjaCernko commented 1 day ago

Thank you very much!