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Mixed item type in one IRT model #14
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I can replicate that behaviour; seems to be a bug. For now, you can avoid it by passing
(@alexanderrobitzsch) The reason seems to be that in case of |
Hi,
I am trying to learn IRT using your package TAM. It has been very helpful.
I got puzzled by the different item types in one IRT model.
There are 20 items in total. The first 16 are dichotomous, last 6 are polytomous.
For example, I first ran a 2PL model as such:
Then, I tried the tamaanify method and specified the item type for the first 14 items to be 2PL, and the last 6 to be GPCM.
Estimate the model:
mod2 <- tamaan(tanmodel1, data)
Request the result:
summary(mod2)
mod1 and mod2 yielded the exact same results. I was wondering if I did something wrong here?
To be specific, I was trying to mimic the
mirt
package:Could you please help me with this?
Thank you!
Erin
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