trevor.bond at jcu.edu.au
Thu May 8 09:52:10 EST 2008
Ferguson wrote about this is 1941;
Ferguson, G. A. (1941). The factorial interpretation of test
difficulty. Psychometrika, 6(5), 323-330.
and it was ignored almost ever since
At 4:13 PM -0400 5/7/08, Michael Lamport Commons wrote:
>Life is more complected. Let us say one is scaling difficulty of
>tasks. One generally will get a single dimension in Rasch but 2 or
>more dimensions in a factor analysis if ... difficulty is made up of
>order of hierarchical complexity and also the number of operations
>such as the number of numbers added. Difficulty can be seen as one
>dimension or two depending on how much you know what the more gross
>variable consists of.
>Michael Lamport Commons
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
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