[Rasch] Modeling sequenced data

Theo Dawson theo at devtestservice.com
Sat Dec 8 05:45:42 EST 2007

My colleagues and I have been collecting data with an instrument  
called the "sort task" for several years. The task involves sorting a  
set of ten statements into the order in which it would have been  
possible for one individual to have made them over the course of 40  
years. (They end up being ordered from 01 to 10.)

We now have hundreds of cases, and would like to model the results. We  
already know that the modal order for each group we have tested is  
virtually always accurate, and that higher level statements are more  
difficult to order than lower level statements there must be a way to  
use the Rasch model to observe the difference in difficulty between  
sorting lower level statements and higher level statements. We also  
have data on age, education, and the techniques people use to do the  
sort and will be examining the relation between these variables and  
sort accuracy.

I've never tried to model data of this type. Can anyone help?


Take the Sort Task Challenge at:  http://devtestservice.com/sorttasklead.php

Theo Linda Dawson, Ph.D.
President & CEO, Developmental Testing Service, LLC (DTS)
35 South Park Terrace
Northampton, MA 01060

theo at devtestservice.com

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At the Developmental Testing Service, LLC (DTS), we are dedicated to  
developing assessments that capture the transformations in thinking  
that occur up to 13 times over the course of the lifespan. Each of  
these transformations leads to a more complex, integrated, and  
adequate way of thinking. Whereas traditional tests do a good job  
examining what people know, our tests examine what people know AND how  
they think about what they know.

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On Dec 7, 2007, at 11:54 AM, Snider-Lotz, Tom wrote:

> The IOMW conference next March looks very interesting, but I must  
> admit that I don't understand the theme, "Constructing Variables."   
> I know this is a common phrase in the Rasch world, and has been the  
> theme for several issues of the Journal of Applied Measurement --  
> but still I don't know quite what it means.  What is the difference  
> between a constructed variable and one that's not constructed?   
> What's involved in constructing a variable?  If I run test results  
> through Winsteps, are the item measures constructed variables?
> I work in employment selection testing, and when I think of  
> variables I think of test scores, supervisory ratings of  
> performance, number of words typed per minute, number of units sold,  
> and so forth.  Would these be included in the domain of variables to  
> be discussed at this conference, and are any of them "constructed"?
> Thanks for any clarification you might offer.
>   -- Tom Snider
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> Rasch mailing list
> Rasch at acer.edu.au
> http://mailinglist.acer.edu.au/mailman/listinfo/rasch

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