[Rasch] Validation & Rasch

Trevor Bond trevor.bond at jcu.edu.au
Fri Nov 23 10:23:34 EST 2007


Dear James,
Mike reminds us of the crucial part :
A. Construct validity: Investigating what the test is actually 
measuring, usually through the item hierarchy from less to more.
That approach is covered in Wilson's Constructing Measures  and Bond 
& Fox 2nd ed.
Wilson, M. (2005). Constructing measures: an item response modeling 
approach. Mahwah, NJ: Lawrence Erlbaum Associates.
Bond, T. G., & Fox, C. M. (2007). Applying the Rasch model: 
Fundamental measurement in the human sciences (2nd ed.) Mahwah, NJ: 
Lawrence Erlbaum Associates.

The papers on the how to, include:
Smith, E.V., Jr. (2001). Evidence for the reliability of measures and 
validity of measure interpretation: A Rasch measurement perspective. 
Journal of Applied Measurement, 2(3), 281-311.
Bond, T. G. (2004). Validity and assessment: a Rasch measurement 
perspective. Metodologia de las Ciencias del Comportamiento, 5(2), 
179-194.

Trying to use any validation technique without a clear a priori 
conceptualization of the object of attention, a theoretically driven 
account about how the underlying latent trait should be expressed 
empirically as item and person behaviour, leaves us with mere 
pragmatic interval-level number-juggling.

Best wishes
Trevor
-- 
Trevor G BOND Ph D
Professor and Head of Dept
Educational Psychology, Counselling & Learning Needs
D2-2F-01A EPCL Dept.
Hong Kong Institute of Education
10 Lo Ping Rd, Tai Po
New Territories HONG KONG

Voice: (852) 2948 8473
Fax:  (852) 2948 7983
Mob:
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