>
> first, items don't have intensity ... people do in response TO an
item ...
An item's intensity is defined in terms of the response it elicits in
persons. I'm using Thurstone's terminology. If you're not happy with
that shorthand, fair enough! :-)
> second, just because (to use an analogy) someone scores (say on a 30
item
> test) high on the test does not mean that they got all items right
nor,
> would we expect them to ... so, just because someone has a fairly
strong +
> feeling towards a bank does not mean that they agree with (nor would
we
> expect them to) all the practices of the bank ...
Who said anything about 'all practices in the bank'? This is probably
not a good way to elicit responses indicative of 'level of
satisfaction'. In principle though, someone higher on satisfaction (X)
than another (Y) should tend to agree with most or all of the
statements that Y agrees with, then some more. If not, you do not have
a basis for obtaining measurements (unless you're using an unfolding
structure).
scale scores (not even
> from a rasch developed scale) are not a true guttman scale
Steve) It is fairly simple to show that Rasch is a probabilistic
Guttman scale -- that is, the patterns of scoring corresponding with
the Guttman structure are most probable under the Rasch model, and
patterns close to the structure are more probable than ones removed
from that structure.
> certainly though ... one does not need the rasch model to detect
these
> tendencies ...
I agree.
Steve.
Sent via Deja.com http://www.deja.com/
Before you buy.
===========================================================================
This list is open to everyone. Occasionally, less thoughtful
people send inappropriate messages. Please DO NOT COMPLAIN TO
THE POSTMASTER about these messages because the postmaster has no
way of controlling them, and excessive complaints will result in
termination of the list.
For information about this list, including information about the
problem of inappropriate messages and information about how to
unsubscribe, please see the web page at
http://jse.stat.ncsu.edu/
===========================================================================
