In recent times the heterotrait-monotrait method has re-emerged as a tool for discriminant validity testing. How accurate and effective is this tool ? How does it compare with the Forner-Larcker criterion ?
Dear Silburn,
The Multitrait-Multimethod Matrix (hereafter labeled MTMM) is an approach to assessing the construct validity of a set of measures in a study. It was developed in 1959 by Campbell and Fiske (Campbell, D. and Fiske, D. (1959). Convergent and discriminant validation by the multitrait-multimethod matrix. 56, 2, 81-105.) in part as an attempt to provide a practical methodology that researchers could actually use (as opposed to the nomological network idea which was theoretically useful but did not include a methodology). Along with the MTMM, Campbell and Fiske introduced two new types of validity -- convergent and discriminant -- as subcategories of construct validity. Convergent validity is the degree to which concepts that should be related theoretically are interrelated in reality. Discriminant validity is the degree to which concepts that should not be related theoretically are, in fact, not interrelated in reality. You can assess both convergent and discriminant validity using the MTMM. In order to be able to claim that your measures have construct validity, you have to demonstrate both convergence and discrimination. Advantages and disadvantages are contained in the article below.
For details on this article which I think would be very helpful, pls click the link below:
http://www.socialresearchmethods.net/kb/mtmmmat.php
Regards.
Dr. Abolo
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