decompose-global-sensitivity

Purpose

Estimate global main effects and interactions across uncertain inputs using screening and decomposition.

Input contract

required: [model, uncertain_inputs, output_metric]
optional: [input_distributions, screening_method, decomposition_method]
constraints: [input distributions and sampling design must be declared]

Procedure

1. Define input ranges/distributions and the output metric.
2. Screen influential variables with Morris or an equivalent declared method.
3. Estimate main and interaction effects with Sobol or an equivalent variance decomposition.
4. Compare sensitivity rankings across sampling assumptions.

Output contract

produces: [screening_report, main_effects, interaction_effects, sensitivity_ranking]
delta_fields: [findings, evidence_updates, uncertainties, decisions]