[Rasch] About scale validity

Mike Linacre (RMT) rmt at rasch.org
Tue Mar 21 21:05:59 EST 2006

Dear Tristan:

What is your reviewer intending by "Scale validity"?

Is this referring to the validity of the measurement scale (usually in 
logits) - answered by the fit of the data to the Rasch model,
or the validity of the rating scale (set of ordered categories)  - answered 
by various diagnostic Rasch indicators,
or the content/construct/predictive etc. validity of the observational 
instrument (e.g., the "Role-based Behavior Scale") - requiring largely 
non-Rasch investigation involving the substantive theory and application of 
the instrument,
or perhaps something else?

Mike L.

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