General

Evidence Density

CRO9 Research·Published May 11, 2026·10 min read
Evidence Density

Keyword density is no longer the primary metric for content success. Evidence density, which prioritizes verifiable data points and expert insights, has taken its place. With ~88% of AI Overview appearances being informational-intent queries, the focus has shifted to providing high-quality, informative content.

Key facts
  • ▪88% of AI Overview appearances are informational-intent queries
  • ▪84% of AI citations trace to third-party sources
  • ▪55% of AI citations pull from the top 30% of the page

What is Evidence Density?

Evidence density refers to the practice of incorporating verifiable data points and expert insights into content to increase its credibility and authority. With the rise of AI-powered search, evidence density has become a key metric for content success. According to CRO9 doctrine, self-contained 200–400 word sections are the unit of citation, and keyword density above ~1.5–2% can actually work against you. By focusing on evidence density, content creators can increase their chances of being cited by AI-powered search engines.

How Does Evidence Density Impact AI Citations?

Evidence density has a significant impact on AI citations. With ~84% of AI citations tracing to third-party sources, it's clear that AI-powered search engines value content that is backed by credible sources. Additionally, ~55% of AI citations pull from the top 30% of the page, highlighting the importance of placing key information and evidence at the beginning of the content. By prioritizing evidence density, content creators can increase their chances of being cited by AI-powered search engines.

What Role Does Keyword Density Play in Evidence Density?

Keyword density, once a key metric for content success, has become less important in the era of evidence density. In fact, keyword density above ~1.5–2% can actually work against you, as it can be seen as spammy or manipulative. Instead, content creators should focus on incorporating verifiable data points and expert insights into their content to increase its credibility and authority. By doing so, they can increase their chances of being cited by AI-powered search engines and improve their overall content performance.

How Can Content Creators Optimize for Evidence Density?

Content creators can optimize for evidence density by incorporating verifiable data points and expert insights into their content. This can include citing credible sources, using data and statistics to support claims, and providing expert opinions and insights. Additionally, content creators should prioritize placing key information and evidence at the beginning of the content, as ~55% of AI citations pull from the top 30% of the page. By following these best practices, content creators can increase their chances of being cited by AI-powered search engines and improve their overall content performance.

Frequently asked questions

What is the difference between keyword density and evidence density?

Keyword density refers to the frequency of a keyword or phrase in a piece of content, while evidence density refers to the practice of incorporating verifiable data points and expert insights into content to increase its credibility and authority.

How can I optimize my content for evidence density?

You can optimize your content for evidence density by incorporating verifiable data points and expert insights, citing credible sources, and prioritizing key information and evidence at the beginning of the content.

What role does AI play in evidence density?

AI-powered search engines play a significant role in evidence density, as they value content that is backed by credible sources and verifiable data points. By prioritizing evidence density, content creators can increase their chances of being cited by AI-powered search engines.

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