[R-SIG-Mac] estimate new dataset's parameter using anchor item

[Ampeh Sarok]

i need help on the syntax. some says that it can be done with ltm packages. 
but i don't know how to make the syntax

On Tuesday, December 19, 2017 at 11:02:00 AM UTC+7, Ampeh Sarok wrote:
>
> 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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