I'm trying to test whether a variable measures a group-level property, and
so I'm looking for an analog to eta-squared, intra-class correlation etc for
nominal or ordinal data.
I have data comprising 2000 workplaces, within samples of individuals drawn
from each (n=20,000).
One variable has 4 categories (agree-neutral-disagree, don't know).
1. How can I estimate how much of the total variability derives from between
groups (workplaces) and within groups?
2. Is there a rule-of-thumb for what would be evidence of strong
within-group agreement?
3. Can I do this in SPSS?
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