[Rasch] psychometrics to measure dynamicity

Parisa Daftari Fard pdaftaryfard at yahoo.com
Fri Jul 30 16:14:59 EST 2010

Dear Dr. Linacre,
Thank you so much for your reply. Yes this is what I needed to learn, but is it possible to have both cases at the same time. Thank you again.


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

From: Mike Linacre (RMT) <rmt at rasch.org>
Subject: Re: psychometrics to measure dynamicity
To: "Parisa Daftari Fard" <pdaftaryfard at yahoo.com>
Date: Friday, July 30, 2010, 9:21 AM

Thank you for your email, Parisa.

>From the Rasch perspective, each person's ability has not changed, but the items are becoming easier.

Data design: T T' T'' ....

You could also model the opposite effect, the item difficulty has not changed, but the person's are becoming more able.

Data design:


Mike L.

At 7/29/2010, you wrote:

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.
Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  24:1 Summer 2010 

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