ICC for binary data in SPSS

[Abhaya Indrayan]

I will be grateful if anybody can make me wise on how to calculate intraclass correlation for a binary outcome (random effects) in SPSS. I need this for a cluster randomized trial with 8 clusters in each of the two arms and each cluster with nearly 300 subjects. The outcome is a disease no or yes coded as 0 or 1. I want a solution in SPSS only (not R or any other package).

Thanks.

~AI

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Dr Abhaya Indrayan

Personal website: http://indrayan.weebly.com

MedicalBiostatistics.com

[Bruce Weaver]

I suggest you post your question to the SPSSX-L forum:

• http://spssx-discussion.1045642.n5.nabble.com/

I am fairly certain there is no built in procedure for what you want, and I've not heard of any user-written macros either.  So it will likely require estimating a model (probably using GENLINMIXED), and "rolling your own" using various bits of the model output. 

Finally, I see that there are at least 5 versions of the ICC for the situation you describe.  If you post to SPSSX-L, it would help to clarify which one(s) you want. 

HTH.

[Paul Johnson]

I'll agree with Bruce and add that there are reasonably straightforward formulae for ICC for GLMMs (including binomial) in these papers:

Nakagawa, S., and H. Schielzeth. 2010. “Repeatability for Gaussian and Non-Gaussian Data: A Practical Guide for Biologists.” Biological Reviews of the Cambridge Philosophical Society 85 (4): 935–56. doi:10.1111/j.1469-185X.2010.00141.x

https://doi.org/10.1111/j.1469-185X.2010.00141.x

Nakagawa, S., P.C.D. Johnson, and H. Schielzeth. 2017. “The Coefficient of Determination R2 and Intra-Class Correlation Coefficient from Generalized Linear Mixed-Effects Models Revisited and Expanded.” Interface 14: 20170213.

http://rsif.royalsocietypublishing.org/content/14/134/20170213

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[Abhaya Indrayan]

Thanks Bruce and Paul.

~AI

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Dr Abhaya Indrayan

Personal website: http://indrayan.weebly.com

MedicalBiostatistics.com

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