[Rasch] Standardizing measures and standard errors

Matthew Enos matthewenos at mac.com
Fri Mar 11 10:57:32 AEDT 2016


Hi Mike!

Is there a place for us Down Under? Things are getting more dicey by the day here in Trump Land! Just joking, for now, but things could get ugly.


Matt

Matthew Enos
320 Crescent Drive
Glenview, IL 60025

847-983-0746




> On Mar 10, 2016, at 5:13 PM, Mike Linacre <mike at winsteps.com> wrote:
> 
> Yes, Stuart.
> 
> You would divide the person and item measures and also their standard errors (model or misfit-inflated) all by the same number.
> 
> Mike L.
> 
> On 3/11/2016 2:43 AM, Stuart Luppescu wrote:
>> Fellow Raschies, I want to standardize Rasch measures and their
>> standard errors. I'm standardizing the measures in the conventional
>> way, and putting the standard errors on the standardize scale by
>> dividing them by the standard deviation of the measures. The question
>> is, is this method valid regardless of whether I use the model standard
>> errors or the fit-inflated (real) standard errors, or do I need to
>> revise the scaling factor to account for the changes in the standard
>> errors due to the fit inflation? My supposition is that I use the same
>> scaling factor regardless of the type of standard error. Amiright?
> 
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