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st: FW: ICC and loneway


From   "Sham Lal" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: FW: ICC and loneway
Date   Thu, 15 Jan 2009 12:56:23 +0000

Dear Statlisters

I am looking to compare the ratings of pain between two observers x1 x2 and am using the loneway command to produce ICC's. However, I don't completely believe that loneway is producing what I require. My data is organised as follows:

Idno    pain_x1     pain_x2
A1        53                   74
A2        62                   23
B3        15                   12
B5         86                  52  

The output after running loneway pain_x1 pain_x2 is as follows:
One-way Analysis of Variance for pain_x1: 

                                              Number of obs =       203
                                                  R-squared =    0.9025

    Source                SS         df      MS            F     Prob > F
-------------------------------------------------------------------------
Between pain_x2         135346.15     68    1990.3846     18.25     0.0000
Within pain_x2          14613.739    134    109.05775
-------------------------------------------------------------------------
Total                  149959.89    202     742.3757

         Intraclass       Asy.        
         correlation      S.E.       [95% Conf. Interval]
         ------------------------------------------------
            0.85839     0.03899       0.78197     0.93481

This is comparing the variation between just pain_x2, I fear this is not correct?
Any help would be appreciated

Sham 


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