OLS · Model refinement
Effect Heterogeneity and Interaction
A single average association can conceal substantively different contrasts across groups.
Page 1 of 7 · Big Picture
The big picture: Effect Heterogeneity and Interaction
Does an association differ across groups?
Why a policy analyst should care
An average association can conceal groups with different effects, but interaction estimates require enough information and must be interpreted jointly rather than coefficient by coefficient.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question Does an association differ across groups?
2 Explore Compare conditional contrasts
3 Formalize An interaction changes the model
4 Transfer Defend a heterogeneity claim
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