Data Structure
Recognizing Clustering in a Dataset
Before choosing a variance estimator, ask whether observations share a county, state, hospital, classroom, provider, or other context.
Page 1 of 7 · Big Picture
The big picture: Recognizing Clustering in a Dataset
Do observations share a context that makes them more alike?
Why a policy analyst should care
Patients treated in the same hospital or residents sharing a county context may provide less independent information than their row count suggests, directly affecting uncertainty and policy confidence.
Follow the idea from the opening question to a practical decision. These are the conceptual moves this module will develop:
1 Question Do observations share a context?
2 Explore Find the cluster identifier
3 Formalize Clustering changes the information in N
4 Transfer Audit the data structure
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