Privacy and disclosure

Excluded private materials

No original sample personal information is published. The public repository excludes:

• the original 21,911-row sample table;
• row-linked exit and destination-probability tables;
• original individual or donor identifiers;
• source-row-to-archetype mappings;
• the private NetLogo model and private inputs;
• absolute local or institutional file paths;
• agent-level snapshots or downloadable agent histories;
• unused source columns or original text fields.

Published materials

The browser receives only aggregate synthetic archetypes, clustered and smoothed profiles, simplified regional geometry, rounded public parameters, and aggregate-output logic.

Disclosure controls

• Source rows were grouped into 80 synthetic archetypes, with small groups merged before public summaries were produced.
• Exit curves were reduced to 10 public profiles and destination distributions to 24 public profiles.
• Weights, category probabilities, age and income summaries, preference summaries, profile mixtures, and public parameters were perturbed and/or coarsely rounded.
• No source-row mapping is retained in the public package.
• Only aggregate national trajectories and regional snapshots can be downloaded.
• Synthetic-agent point locations are not shown.

Limitations

This is an engineering disclosure-reduction workflow, not formal differential privacy and not legal certification of anonymisation. Anything delivered to a browser can be inspected; only materials approved for public visibility are included.