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Expectation-maximization for factor analysis
Tutor me on https://mlprep.iwase.dev/item/pml-book1-ex20.1/. This is a practice item. If window.mlPrepAgent is available, read attempts for item pml-book1-ex20.1 before tutoring. Inspect my attempt, keep the item ID, and do not reveal the full answer first. After a real attempt, append its record with recorded_by agent, include agent_session_id when available, and read it back.Derives E- and M-step updates for a latent Gaussian factor model.
Source caveat
This is advanced latent-variable practice rather than clustering; the public solution manual predates the dated book draft.
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