Public methodology

SpareSignal Rating Definitions

SpareSignal ratings describe evidence strength, compatibility uncertainty, marketplace noise, part-number ambiguity, risk, and freshness. They are not buying recommendations and do not verify third-party product quality, safety, filtration performance, or manufacturing consistency.

Marketplace listings are signals, not compatibility proof. Seller claims are not official fit evidence. SpareSignal ratings are not buying recommendations and do not verify third-party product quality, safety, filtration performance, or manufacturing consistency.

What ratings are for

Ratings help users understand the evidence behind a compatibility answer: what is supported, what remains uncertain, and which evidence layers are driving the risk picture.

Ratings do not rank products.
Ratings do not certify filter quality, performance, safety, seller reliability, or fulfillment accuracy.
Ratings keep official compatibility evidence separate from marketplace seller claims.

Rating dimensions

Compatibility Confidence

Meaning: How strongly the current evidence set supports the model-to-part relationship.
Interpretation: High: confirmed compatibility plus official or high-trust evidence.
Medium: some evidence exists, but ambiguity remains.
Low: weak, indirect, marketplace-only, stale, or conflicting evidence.
Not enough evidence: no compatibility records are currently available.
What it does not mean: Product quality, seller reliability, or a buying recommendation.

Evidence Strength

Meaning: The source strength behind the compatibility answer.
Interpretation: Strong official coverage: multiple official or high-trust records support the relationship.
Moderate official coverage: one official or high-trust source is present.
Weak or missing official coverage: official evidence is absent, unclear, or indirect.
What it does not mean: Seller reliability or that retailer listings are official evidence.

Misfit Risk

Meaning: The risk that model naming, part-number ambiguity, regional SKU uncertainty, seller wording, or conflicting claims could lead to a wrong part decision.
Interpretation: High: conflicting evidence, high ambiguity, broad model claims, or marketplace-heavy support.
Medium: some ambiguity exists.
Low: model and part relationship is clear and risk flags are limited.
Not enough evidence: the current evidence set does not yet support a risk rating.
What it does not mean: Physical product safety or quality.

Marketplace Noise

Meaning: The amount of seller-listing, platform, availability, review, and marketplace wording ambiguity around a model or part.
Interpretation: High noise: many observed marketplace records contain broad model claims, mixed part numbers, unavailable sources, or review-fit concerns.
Medium noise: some marketplace ambiguity is present.
Low noise: limited marketplace ambiguity is observed.
Not captured: marketplace evidence has not been captured.
What it does not mean: That every listing is wrong, or that the score measures market share.

Part-number Ambiguity

Meaning: The risk created by similar, missing, mixed, region-specific, or unresolved part numbers.
Interpretation: High ambiguity: several part-number conflict signals are present.
Medium ambiguity: some uncertainty exists.
Low ambiguity: part-number relationship is relatively clear.
What it does not mean: That similar-looking part numbers are equivalent, or that ambiguity proves incompatibility.

Data Freshness

Meaning: How recently the current evidence set was checked.
Interpretation: Fresh: recently checked evidence.
Aging: older evidence that may still be useful but should be rechecked.
Stale: old, unavailable, or likely outdated evidence.
Not captured: no checked date is available.
What it does not mean: That the source has not changed since the checked date or that it reflects live stock status.

Official Evidence Coverage

Meaning: How much official or high-trust evidence is available for the model and part context.
Interpretation: Broad official coverage: several official or high-trust records are present.
Official evidence present: at least one official or high-trust source is present.
No official evidence captured: no official evidence is currently available in the evidence set.
What it does not mean: That marketplace claims fill the official evidence gap or make every listing valid.

Current snapshot labels are slightly narrower in the live rating builder: Compatibility Confidence can return Not enough evidence when no compatibility records are available, Evidence Strength currently emits Strong or Weak, and Official Evidence Coverage currently emits Present, Partial, or Not enough evidence.

Status meanings

Confirmed

The current evidence supports the compatibility relationship.

Likely

High-trust evidence points toward the relationship, but the evidence set is not fully explicit.

Claimed

The relationship appears in seller or marketplace text only.

Unresolved

The current evidence does not confirm the relationship.

Marketplace signal

Observed seller, retailer, review, availability, or platform-level information only.

Conflicting

Evidence appears inconsistent across sources, regions, part numbers, or model families.

Deprecated

The relationship may refer to older, replaced, or superseded evidence.

Reported incompatible

The available evidence indicates a wrong-fit or incompatible relationship.

Source unavailable

A previously observed source is no longer reachable or no longer shows the relevant information.

Evidence level meanings

Evidence levels describe the source type behind a compatibility or risk record. Retailer listings and marketplace seller claims are weaker than official manufacturer evidence and should not be treated as official fit evidence.

official_website

Manufacturer-controlled web page or official product/support page.

official_document

Manufacturer manual, support document, compatibility document, or published specification.

manufacturer_support

Manufacturer help-center, support, or service material.

retailer_listing

Retailer page or commerce listing. Useful as a signal, weaker than official manufacturer evidence.

marketplace_seller_claim

Seller listing text or seller-provided compatibility wording. Marketplace signal only.

review_signal

User review or user-reported fit, mismatch, quality, odor, installation, or performance signal. Risk context only.

unverified_web_claim

Web claim without enough source control, provenance, or verification to support official compatibility.

How to read a rating snapshot

Read it as

What is supported.
What remains uncertain.
Where marketplace noise appears.
When the evidence was checked.

Do not read it as

A product recommendation.
A seller recommendation.
Quality verification.
A fit guarantee claim.

See ratings in use

These pages show how SpareSignal applies rating definitions across evidence guides, marketplace noise reports, and conflict adjudication pages.

Full methodology

For the broader evidence model, status handling, data freshness, and buying recommendation boundary, read How SpareSignal Rates Compatibility Evidence.