[Rasch] psychometrics to measure dynamicity

Parisa Daftari Fard pdaftaryfard at yahoo.com
Fri Jul 30 13:14:09 EST 2010

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

From: Mike Linacre (RMT) <rmt at rasch.org>
Subject: Re: [Rasch] psychometrics to measure dynamicity
To: rasch at acer.edu.au
Date: Friday, July 30, 2010, 4:03 AM

Thank you for your question, Parisa.

We can certainly measure "dynamicity". The underlying latent trait must remain constant. At each new time-point, the person becomes a new "person" with a new location on the latent trait. We need some of the same (or almost the same) items across pairs of time points. Then we can construct a data matrix looking like Figure 2 in http://www.rasch.org/rmt/rmt61e.htm


Mike L.

At 7/29/2010, you wrote:

Dear List members,
I have a question and I hope to have your response. As far as I know, statistics and psychometric are set to measure static nature of the trait. Can we use statistics to measure dynamicity of the trait. For example, in Dynamic assessment, where tutor attempts to provide feedback (first implicitly then explicitly) according to learner's responsiveness, the trait is not static but dynamic. This means that similar outcome on post test is achieved through different procedures or hint. 
How is it possible to use psychometric to measure dynamicity?
I appreciate your reply in advance.
Parisa Daftarifard
Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  24:1 Summer 2010 
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