Redesign the statistical model selection experience

[codoom1]

What changed

Product structure

• Rebuilt the shared navigation and footer around the core workflows: model selection, model library, questionnaires, and expert support.
• Added the missing all-models route and routed every generic model link to the full catalog.
• Removed placeholder language, notification, documentation, blog, and social navigation.

Statistical model experience

• Reorganized the model library into searchable statistical families with clear model metadata.
• Redesigned the guided analysis form, recommendation results, model details, search results, errors, and empty states.
• Removed the random scoring component so identical analytical inputs produce reproducible recommendations and deterministic tie-breaking.

Visual system and accessibility

• Added a cohesive navy/teal research-oriented design system shared across the application.
• Improved responsive behavior, focus states, semantic headings, labels, contrast, skip navigation, and reduced-motion support.
• Restyled the statistical assistant to match the application.

Root problems addressed

The application mixed several unrelated visual themes, generic navigation sent visitors only to regression models, the catalog was flat, several links pointed to missing routes, and recommendation scores included randomness.

User impact

The application now presents a clearer path from research question to recommendation, comparison, validation, and implementation. Visitors can find all model families, understand why a method fits, compare alternatives, and navigate consistently on desktop or mobile.

Validation

• python -m pytest -q tests/ — 120 passed
• Focused route, integration, and authentication tests — 55 passed
• Rendered-page inspection for home, form, catalog, model group, details, search, results, and 404 states
• Strict Python undefined-name/syntax lint — passed
• git diff --check — passed

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Project	Deployment	Actions	Updated (UTC)
statistical-model-suggester	Ready	Preview, Comment	Jul 24, 2026 11:16pm

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