Advice, please?

Posted by Doyle, Jennifer on Jan 10, 2012; 2:52pm
URL: http://spssx-discussion.165.s1.nabble.com/Advice-please-tp5134250.html

Good Morning~

I have a question regarding z-scores:  I have a database consisting of 121 subjects, each of whom was interviewed by 4 different interviewers:

3 individuals and 1 panel (consisting of a variety of 4-8 individuals) on 4 different dates -- the 3 individuals remained the same on the 4 dates, but the panels varied in terms of who sat on them.  Each interviewer (and panel) graded each interaction on a 4-point scale (A-D).

My question is this:  is it valid to simply calculate a z score on the average of the 4 raw scores / grades each subject received? --

OR
Do I need to calculate individual z-scores for each interviewer -- and how do I then calculate a valid z-score for panels--and then average those to rank subjects? Any guidance would be HUGELY appreciated! 

Best, Jennifer

Jennifer Doyle, M.A.
Lecturer on Surgery, Harvard Medical School
Director of Surgical Education
Massachusetts General Hospital
55 Parkman Street - WAC 455Q
Boston, MA 02114
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