tf–idf, short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or corpus. It is often used as a weighting factor in information retrieval and text mining.The tf-idf value increases proportionally to the number of times a word appears in the document, but is offset by the frequency of the word in the corpus, which helps to control for the fact that some words are generally more common than others.Variations of the tf–idf weighting scheme are often used by search engines as a central tool in scoring and ranking a document's relevance given a user query.
Posts about Tf-Idf
  • On-Page SEO Part 2: Optimizing Each Piece of Content for Search

    …. However, the simple presence of your keywords will never be enough to rank your content in today’s high-competition search environment, and if you overdo it, you can expect to be penalized. Today, there’s even more to it than keyword frequency. Google also has several patents that indicate the value of Term Frequency – Inverse Document Frequency (TF-IDF…

    ImageWorks Creativein SEO Content- 5 readers -
  • Google’s Query Language

    … query terms (a hit) in one of the attribute, value, or source portion of the fact. Each hit is scored based on the frequency of the term that is hit, with more common terms getting lower scores, and rarer terms getting higher scores (e.g., using a TF-IDF based term weighting model). The fact score is then adjusted based on additional factors…

    Bill Slawski/ SEO by the Seain Google Facebook- 15 readers -
  • More than Keywords: 7 Concepts of Advanced On-Page SEO

    … sentences, paragraphs, and other HTML elements. How do search engines know that "Labrador" relates to "dog breeds" when the two phrases aren't in the same sentence? Search engines solve this problem by measuring the distance between different words and phrases within different HTML elements. The closer the concepts are semantically, the closer…

    Moz Blogin SEO Google- 15 readers -