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Date:   Fri, 16 Aug 2002 06:31:55 +0100
Reply-To:   Chris Evans <>
Sender:   "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:   Chris Evans <>
Subject:   Re: Reliability analysis
In-Reply-To:   <>
Content-type:   text/plain; charset=US-ASCII

On 16 Aug 2002 at 9:42, Sue Cotton wrote:

> I was wondering whether someone would know the difference between > single and average intraclass correlation coefficients that are > produced in output of SPSS after running reliability analysis. > > Which one is the best estimate to use? Depends what you want to use your data for. If you have multiple rater data and will only use one rater at a time in future then the single ICC is the estimate of the population single rater reliability. If you have (say) five raters and will always use five, or data from all 21 items from a measure and will always use the whole measure, then the average ICC is the estimate of the population reliability of all five raters or the full scale.


Chris-- Chris Evans <> Consultant Psychiatrist in Psychotherapy, Rampton Hospital; Associate R&D Director, Tavistock & Portman NHS Trust; Hon. SL Institute of Psychiatry *** My views are my own and not representative of those institutions ***

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