Understanding TF-IDF and Entity Density
In traditional SEO, keyword density was a primary ranking factor. In the era of Generative Engine Optimization (GEO), the focus has shifted from mere "keywords" to "entities." An entity is a singular, unique, well-defined thing or concept. The Entity Density Analyzer calculates the ratio of your target concept against the total word count of your document to ensure optimal indexing by systems like Google's Knowledge Graph and Perplexity's retrieval nodes.
What is the Ideal Density for AI Search?
Modern Natural Language Processing (NLP) models are incredibly sophisticated at detecting spam. If your entity density exceeds 4-5%, the algorithm flags the content as manipulated, drastically reducing its chances of being cited in an AI-generated summary. The sweet spot for RAG (Retrieval-Augmented Generation) systems is typically between 1.5% and 3.0%. This provides enough statistical weight for the LLM's attention mechanism to recognize the primary subject without triggering quality degradation penalties.