It is desired to obtain an ability measure for each person on each item, but in a common frame of reference.

 

A) Format the control and data file.

Include facets for persons, items, etc. Non-center the persons.

 

B) Perform a conventional analysis.

Each person has one ability. Each item has one difficulty. Produce an Anchorfile=

 

C) Edit the anchor file.

Remove the ",A" for the person facet. Comment out all except one item with ";" in the items part of the Labels= section.

 

D) Perform an analysis.

This will produce measures for the persons on the specified item.

 

E) Repeat (C) and (D) for all other items to produce person measures on each of the items in turn.