[Rasch] validating questionnaire through Rasch model

Trevor Bond trevor.bond at jcu.edu.au
Sun Sep 5 21:38:00 EST 2010


Dear PDF,
First an observation and then a structure for your learning , if I might.

There is not and never will be a box to click on Rasch software to "Test validity".

Validity is a much more complex issue than that; Rasch will help, but good 
theory driven item development t is a prerequisite.

So, start with a good blurb on Validity:
e.g., Sam Messick is a pretty good Start:
Messick, S. (1995). Validity of psychological assessment. American Psychologist, 
50(9),74–149.

Then go to chapter 13 of your favourite book ;-)) and get an intro to the Messick 
/ Rasch link there.

That is developed further in:
Bond, T. G. (2004). Validity and assessment: A Rasch measurement perspective. 
Metodologia de las Ciencias del Comportamiento, 5(2), 179–194.
and
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.

The two Smith and Wolfe papers then develop the detail of how to & 
interpretation very nicely:
Wolfe, E.W., & Smith, Jr. E.V. (2007). Instrument development tools and activities
for measure validation using Rasch models: Part I–Instrument Development 
Tools. Journal of Applied Measurement, 8, 97-123.
 
Wolfe, E.W., & Smith, Jr. E.V. (2007). Instrument development tools and activities
for measure validation using Rasch models: Part II–Validation Activities. Journal 
of Applied Measurement, 8, 204-233.

and then trawl RMT/ Google  as suggested by Mike for lots of examples:
Please Google:  validate Rasch Likert and: validate Rasch rating scale

You will find many webpages, for instance, 
http://www.waset.org/journals/ijpbs/v2/v2-3-25.pdf - 
http://www.uky.edu/~kdbrad2/IFSP-AERA20071.pdf - and many more.

a few ordered steps to help you on the way...

ok?
best wishes

T




Prof Trevor G BOND
Adjunct Professor
School of Education
James Cook University
AUSTRALIA
mob: +61 416 82 70 83


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