[Rasch] Rasch Instrument
trevor.bond at jcu.edu.au
Tue Sep 20 17:24:13 EST 2011
There are some key steps along the way:
Step 1, crucially, is check that the intervals between item difficulties remain INVARIANT (within error) across the two samples!
Common item linking (see Ch 5 B&F2 for reasoning / examples / XL spreadsheet)
On 20/09/11 5:11 PM, "Juanito Talili" <talilij at yahoo.com> wrote:
The instrument (say, to measure personality) was developed using Rasch Model using sample data from a population of professional people.. Assuming that the instrument now is valid and reliable based on Rasch. Can I use the instrument to measure personality to uneducated people (or say sample that are not from a population of professionals)?
Thank you for any comment.
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