[Rasch] Separation & Unidimensionality in Winsteps

Juanito Talili talilij at yahoo.com
Sat Jun 28 10:24:25 EST 2008


Hi Winsteps users and/or Rasch Experts,
 
I have some questions:
 
1. What is the range of a good person separation? How to interpret it?
2. What is the range of a good item separation? How to interpret it?
3. With reference to the Winsteps outputs, what statistics are used to support unidimensionality?  Is the large percent of variance explained enough to support unidimensionality?
4. With reference to the Winsteps outputs, what are the indications of multidimensionality?
 
Thank you.
 
J. Talili



      
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