Coverage & Explainability

Art-market interpretation depends on what data is available, how reliable it is and how consistently it can be compared.

A market signal is never independent from its source context. A result from a major international auction house, a regional sale, a specialist sale, an online-only sale or a private-market reference may not carry the same meaning.

For this reason, Artmetria aims to make coverage visible, so users can understand not only what the platform says, but how much context supports it.

Active coverage refers to sources, houses, categories or segments that Artmetria can currently process with enough consistency to support analytical use.

This may include auction houses, sale categories, time periods, artist groups, regions or object types where the platform can collect, normalise and interpret data within a defined methodological frame.

Active coverage does not mean perfect coverage. It means the source or segment is sufficiently structured to be used responsibly inside the platform.

Some sources may be watched before they are fully indexed.

A house, fair, artist, sale calendar, event or publication may appear in Artmetria’s monitoring layer without being included in active scoring, Index outputs or automated recommendations.

This distinction matters.

Monitoring helps Artmetria identify relevant signals and future expansion areas. Indexing requires a higher level of data consistency, normalisation and methodological confidence.

Partial coverage means that Artmetria has some usable information, but not enough to treat a source, artist, segment or category as fully represented.

This may happen when:

• only some sales are available;
• lot-level information is incomplete;
• estimates or results are missing;
• historical depth is limited;
• source formats vary over time;
• image or provenance data is inconsistent;
• a category is too broad or too thin to compare reliably.

Partial coverage should not be read as absence of value. It means the available signal must be interpreted with caution.

The art market is uneven by nature.

Some regions have stronger public auction visibility. Others rely more heavily on galleries, private sales, fairs or informal networks.

Some categories produce frequent comparable records. Others are rare, episodic, highly specialised or dependent on expert attribution.

Artmetria’s coverage may therefore be stronger in some geographies, houses, periods or categories than in others.

This is not a failure of the method. It is a condition of responsible market interpretation.

Coverage affects how scores should be read.

A score supported by broad, consistent and recent data may carry a different level of confidence than a score based on limited, sparse or uneven information.

For this reason, Artmetria may use coverage notes, confidence indicators, data-quality warnings or source-context explanations where relevant.

A score is more useful when users can see the conditions under which it was produced.

Recommendations are also affected by coverage.

If an artist, category or region is only partially covered, Artmetria may still suggest it as an exploratory path, but such a recommendation should not be understood as a complete market assessment.

A recommendation may reflect aesthetic affinity, contextual relevance, visible market activity or educational interest. It does not mean that all relevant data has been captured.

Coverage also depends on access, rights and availability.

Some data may be public but inconsistent. Some information may be delayed, revised or removed. Some images or catalogues may not be reusable inside Artmetria.

Where source limitations exist, Artmetria aims to preserve caution rather than create false precision.

Coverage improves through several layers:

• adding new sources;
• deepening historical records;
• improving lot-level normalisation;
• refining categories and periods;
• strengthening artist matching;
• distinguishing active indexing from monitoring;
• adding confidence and data-quality indicators;
• learning from user behaviour and expert review.

The goal is not to pretend that the art market can be fully captured. The goal is to make the available signal clearer, more contextual and more responsibly interpreted.

If something is not covered, it should not be assumed to be unimportant.

If something is partially covered, it should not be treated as fully understood.

If something is actively covered, it should still be read within its category, source, region, date and confidence context.

Artmetria is designed to help users read market information more carefully, not to erase the complexity of the market itself.