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Prior vs Posterior

NIST CSF 2.0 · Compare the model prior with the posterior after conditioning on new evidence. Recommended opening view: CSF Maturity Tier → Regulatory Exposure.

Why prior vs posterior matters

The prior is the population baseline — what the model expects before any case-specific information arrives. The posterior is the personalised prediction after conditioning on what is actually known. The shift between them measures the information value of the evidence.

A node that barely updates despite strong evidence signals a missing pathway in the graph. A node that updates sharply even when not directly observed reveals indirect propagation through the network. For decision-making under uncertainty, the posterior is what matters — but the prior provides essential context for judging whether an update is plausible or the evidence is genuinely surprising.

Start here
  1. Open the recommended scenario for this case
  2. Adjust observed evidence or intervention settings
  3. Move to a second tool without losing context
  4. Compare obs() versus do() where available
  5. Inspect paths, blankets, or CPT structure to explain the shift
Evidence update

Posterior means are computed with exact multivariate Gaussian conditioning from the structural covariance implied by the uploaded model.

Posterior shifts
NodePriorPosteriorΔ
Model coverage

Visible nodes: 14 · Latent nodes: 11 · Total nodes: 25. Latent nodes are hidden by default except where they are the point of the analysis.