[Rasch] Person Dimensionality

Mike Linacre mike at winsteps.com
Fri Dec 12 11:24:31 EST 2014

Thank you for your email, Tim.

Yes, your interpretation looks good to me.

Yes, "Dimension" or "Strand" is usually used of items.

For persons, "Style" or "Attribute" - also please Google - synonym trait 
- for some other suggestions.

In previous times, guessers vs. not-guessers was analyzed using Rasch 
outfit statistics. Please try plotting log(outfit mean-square) against 
loading. Is that an informative plot?


Mike L.

On 12/12/2014 10:02 AM, Stoeckel, Tim wrote:
> *In your opinions, would it be appropriate to refer to this as a 
> dimension? If not, how might it be referred to? *I am considering 
> describing this as something like “The pattern of residual loadings in 
> the data suggests [quite clearly?] that test scores reflect not only 
> the primary latent construct but also willingness to skip unknown test 
> items. *Would you agree with that interpretation of the data?*

Mike Linacre, mike at winsteps.com or winsteps1234 at gmail.com
Winsteps: www.winsteps.com/winsteps.htm - current version 3.81.0 - 
February 2014
Facets: www.winsteps.com/facets.htm - current version 3.71.4 - January 2014
Winsteps and Facets Tutorial PDFs at www.winsteps.com/tutorials.htm
Your comments and questions are welcomed.
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