[Rasch] (no subject)
talilij at yahoo.com
Thu Nov 17 16:54:31 EST 2011
A self-administered "Computer Laboratory Usability Questionnaire" consists of 43 five-point ordinal scale items (1=strongly disagree to 4 strongly agree). The instrument, moreover, consists of six factors with the following number of items: 3, 3, 4, 7, 12, and 15. The questionnaire was developed using CTT.
1) Now, I want to re-validate the instrument using Rasch Model. My sample now is already more than 3000. The samples are students who rated six different computer laboratories (LAB1, LAB2....LAB6). Shall I use only sample from one LAB?
2. Can I do the Rasch analysis for the 43 items as if unidimensional? Then, do an EFA using the resulting measures?
Your comments are highly solicited.
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Rasch