I have a first dataset, 100 items with 1000 respondens. I already done the IRT test with 2pl for these 100 items. I had discriminant and difficulty for each item.
If I have a second dataset, let's say 95 items with 1000 respondens I want to find item discriminant and item difficulty for 95 items of second dataset using 5 items as anchor from first dataset. how to do that with packages mirt or ltm? or any other packages can do that? can you help me with the syntax?
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