[Rasch] Modeling content delivered

Jacob Kean jacob.kean at gmail.com
Sun Sep 26 03:16:42 EST 2010


Thank you, Mike. Yes, the items can be spiralled, and there is ongoing
intervention during the period of administration. Thank your for your
suggestion to explore rater leniency. I will pursue this direction.

Sincerely,

Jacob

On Sat, Sep 25, 2010 at 9:06 AM, Mike Linacre <rmt at rasch.org> wrote:

> Jacob:
>
> You describe an exciting situation. A couple of questions:
>
> 1. Could the math items be spiralled so that different students respond to
> different items on different days?
>
> 2. Is there an intervention during the administration (such as math
> teaching)?
>
> Let's assume the items are spiralled in some way, and there is an
> intervention which operates uniformly across the students, then we could
> estimate this Rasch model:
>
> (baseline ability of person n) + (learning effect up to day d) -
> (difficulty of item i) -> observation
>
> This parallels studies of changes in rater leniency across rating sessions.
>
> Mike Linacre
> mike at winsteps.com
>
>
> At 9/25/2010, you wrote:
>
>> Hello-
>>
>> Can anyone point me to an example where a Rasch model was used to evaluate
>> unique test items administered over a series of days? For example, could a
>> Rasch model be used to calibrate a math test delivered two items per day
>> over the course of a couple of weeks? If this is a reasonable goal, what are
>> the pitfalls?
>>
>> Thank you for your input.
>>
>> Jacob Kean
>>
>
>
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