Activity: think-pair-share the derivation of the straight line likelihood, having just seen the XrayImage one.
PDF characterisation in data analysis: analytic, or simple gridding/tabulation. Straight line example. Posterior inferences as integrals. Marginalisation. Extensible for homework.
Visualize and summarize PDFs in various ways. Point estimates, credible intervals, and their meaning. Delta chisq. Corner plots.
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