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Junjun
Junjun
Level I

intraclass correlation coefficient (ICC2,1)

Created: Mar 5, 2023 07:53 AM  |  Last Modified: Jun 8, 2023 9:31 AM (2123 views)

Hi, I would like to know how to perform intraclass correlation coefficient (ICC2,1, two-way random effect model). 

The data I have is from 150 people answering to a test repeatedly measured twice, 2 weeks after the initial test.I would like to know the ICC of this test.

Sorry, if I have not made myself clear enough to answer to this question.

 

Thank you very much.

 

 

 

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2 REPLIES 2
MRB3855
Super User MRB3855
Super User

Re: intraclass correlation coefficient (ICC2,1)

Mar 6, 2023 05:28 AM (2104 views)  |  Posted in reply to message from Junjun 03-05-2023

Welcome to the community. Yes, more info would be helpful; so, you say you have a repeated measures design with two-way random effects? Recognizing potential proprietary issues, can you lay it out more clearly/explicitly for us? How are the subjects allocated to the random factors? Fixed effects? etc...

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Junjun
Junjun
Level I

Re: intraclass correlation coefficient (ICC2,1)

Mar 7, 2023 01:11 AM (2078 views)  |  Posted in reply to message from MRB3855 03-06-2023

 Thank you for your reply.

After I asked my question, I found the paper below.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4913118/]

 

I think what i wanted to do was a two Two-way random effects, absolute agreement, single rater/measure.

I can now see that JMP will calculate ICC (with bias and interaction), so I think this will correspond to ICC(2,1).

Thank you for the help.

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