[Rasch] psychometrics to measure dynamicity

Parisa Daftari Fard pdaftaryfard at yahoo.com
Fri Jul 30 14:29:23 EST 2010

Dear Dr. Linacre,
Thank you so much for your reply. In Dynamic Assessment, the same test is taken but each time with more hints starting from the most implicit one to the most explicit one. It is assumed that each person has two kinds of ability one is actual which is represented in the first administration and potential which is exhibited through mediation and cooperation with a know how. Some individuals, hypothetically, cannot reach answer even with help and some will reach the answer through first hint or help some through more. 
I dont understand which part of this equation is static. Maybe the actual level of ability is something fixed. Can I study a pattern of such a data through Winstep or Facet or any Statistical procedure.

--- On Fri, 7/30/10, Mike Linacre (RMT) <rmt at rasch.org> wrote:

From: Mike Linacre (RMT) <rmt at rasch.org>
Subject: psychometrics to measure dynamicity
To: "Parisa Daftari Fard" <pdaftaryfard at yahoo.com>
Date: Friday, July 30, 2010, 7:59 AM

Thank you for your email, Parisa.

"Test A with more hints" - this is challenging.

There are the original Test A items. Now there is Test A' with easier items.

If the person abilities have not changed, then we can use common-person equating to discover how much easier the items have become.

But it both the item difficulties and the person abilities change, then we have an ambiguous situation. We need some item difficulties, or some person abilities that do not change. These can be used for equating.


Mike L.

At 7/29/2010, you wrote:

Dear Dr. Linacre,
Thank you so much for your reply. so you mean that if I repeat my Test A with more hints 
how would be the possible data set in Winstep. I mean should I enter persons for each set of test as a new person 
1 1' 1''
2 2' 2''
I appreciate your always help in advance. You are one of the supporting angels of this list.
Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  24:1 Summer 2010 

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