"Negative Nonindependence"/"Frog Pond... PreviousNext
Mplus Discussion > Multilevel Data/Complex Sample >
 Michael J. Zyphur posted on Saturday, July 16, 2005 - 4:56 pm
does anyone have any experience with modeling multilevel data where there is a negative ICC? I have run across such a problem and believe that, whenever there is a type of "zero sum" effect (e.g., amount of time talking for each person within a group in a 5 minute period) or an effect where in-group members want maximal differentiation within group, this will be very common. I can also imagine other instances (e.g., outcomes of tennis matches, where 1 = win and 0 = lose, and players are nested within matches) where this type of effect is common.

I know that HLM, because it calculates nonindependence using variance terms, cannot handle such a model. Can Mplus (I am assuming not)? If not, in single-level analyses, should correction to parameters based on ICCs be done by hand (computing ICC with a method which allows it to be negative... this would be simple because when ICC = .5 or -.5, this is the same degree of nonindependence)? How 'bout multilevel analyses, any possibilities?

Thanks for any reply.
 bmuthen posted on Monday, July 18, 2005 - 5:14 pm
I don't have experience with this. I know there is some writing on it, say in the Gary Koch's encyclopedia entrance on icc. Perhaps you can attempt to capture this if you can model the interaction between group members using a "multivariate approach", that is having all members explicitly in the model.
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