Craig, I'll hit the book of knowledge: SPSS user guides on Monday & see what
I can come up with. In the meantime, what I used to do when I was doing my
PhD and I got stuck, was to Phone SPSS user support, I always found them
helpful.

Good luck
Simon

----- Original Message -----
From: Craig Payne <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, July 28, 2000 10:06 AM
Subject: Interpreting an ICC (type 2,1) from SPSS


> Anyone with some knowledge of ICC's??????. I got the following from SPSS -
> I have rechecked it several times and can't work out how to interpret the
> ICC with a negative value (-1.5523) and greater than 1
(95%CI: -8.5186-0.7043)
>
> ___________________________________________________________
>   R E L I A B I L I T Y   A N A L Y S I S   -   S C A L E   (A L P H A)
>                          Intraclass Correlation Coefficient
>
> Two-Way Random Effect Model (Consistency Definition):
> People and Measure Effect Random
>  Average Measure Intraclass Correlation =  -1.5523
>     95.00% C.I.:            Lower =  -8.5186          Upper =    .7043
> ________________________________________________________________
>
> How can this be when ICC's are supposed to be between 0 and 1 ????
> Anyone have any idea ????????????
>
>
> Kind Regards
> CP
>
> ***************************************o00o-()-o00o***********
> Craig Payne                                    email:
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> Department of Podiatry phone: (+61)(3) 9479 5820
> School of Human Biosciences fax: (+61)(3) 9479 5784
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> http://www.health.latrobe.edu.au/Schools/POD/home.html
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>



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