[Rasch] A basic question about variance calculations

Imogene Rothnie irothnie at usyd.edu.au
Tue Aug 20 10:32:42 EST 2013

Dear All
I've been calculating the variance explained after a Facets analysis using the information from table 5 and 7 output in Facets and the formulas provided in the Help menu. A basic question: when we calculate a % variance explained for a facet, say Judge, is the a % of the 'variance explained ' total ? Or is it variance explained /100% ? (ie 100% including the residual error). Hence 40% variance explained by Judges  when 50% variance explained by the measures would be 20% variance explained of total in the former...?

IMOGENE ROTHNIE | Lecturer (Assessment)
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