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

[Ampeh Sarok]

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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