Date:         Sun, 27 Jan 2008 23:05:26 -0800
Reply-To:     John Amora <bayesian2001@yahoo.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         John Amora <bayesian2001@yahoo.com>
Subject:      reliability analysis
Content-Type: text/plain; charset=iso-8859-1

Dear all,

I am conducting reliability analysis (part only of the
entire analysis) of a newly developed instrument with
50-items, which aims to measure the teacher
performance.  The instrument was administered to a
total of 300 students to rate the teaching performance
of their respective teacher.  There were 30 teachers
rated; thus, on average, there were 100 students who
rated for each teacher.

I need your expert opinion because I dont know which
one is correct:

(1) Do I analyze the 300 sample to conduct the
reliability analysis?

Or

(2) Do I analyze the aggregate data-teacher level?
That is, for each item I compute first the mean
ratings of the students within each teacher, then use
the 30 teachers as sample for analysis?

Thank you.

Johnny


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