What does a coherence score measure in keyword expansion?

The coherence score specifically measures the conceptual relationship of returned words in the context of keyword expansion. In keyword research and search engine optimization, coherence is essential because it indicates how well the selected keywords align with each other based on their meanings and associations. A high coherence score suggests that the keywords are relevant to a particular topic and work well together to create a unified theme, which can significantly enhance the effectiveness of content, improve search engine rankings, and ensure that the material resonates with the intended audience.

In contrast, the other concepts do not directly relate to the measurement of word relationships. For instance, measuring the level of similarity between documents pertains more to document clustering or text similarity metrics rather than keyword relevance. The relevance score of keywords focuses on how appropriate a keyword is for a particular search query without specifically examining how words relate to one another. Categorization accuracy evaluates how well items are classified into predefined categories rather than looking at the interrelation of keywords in a broader context. Therefore, the answer accurately reflects the purpose and utility of a coherence score.