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st: Re: FW: ICC and loneway


From   "Joseph Coveney" <[email protected]>
To   "Statalist" <[email protected]>
Subject   st: Re: FW: ICC and loneway
Date   Fri, 16 Jan 2009 00:08:50 +0900

Would something like the following be closer to what you're looking for?

clear *
set more off
input str2 Idno pain_x1 pain_x2
"A1" 53 74
"A2" 62 23
"B3" 15 12
"B5" 86 52
end
reshape long pain_x, i(Idno) j(observer)
encode Idno, generate(patient)
loneway pain_x patient
exit

Joseph Coveney


Sham Lal:

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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