What is WDF*IDF analysis?

WDF*IDF stands for "Within Document Frequency*Inverse Document Frequency"and is an advanced method oftext analysisused insearch engine optimization (SEO). The aim of this analysis is to optimize the relevance of a text with regard to specificsearch termsby determining the weighting of the keywords used.

This method helps to identify which words in a text are over- or underrepresented compared to an average document within a document collection (e.g., a website or news feed). The formula helps determine theoptimal frequency of keywordsto rank higher in search engines without falling into the trap of "keyword stuffing."

WDF*IDF analysis is apowerful toolinSEO because it helps optimize content so that search engines consider it particularly relevant for specific keywords.

By optimizing keyword density based on analysis, website operators can ensure that their content remains natural and informative for both search engines and readers. This often leads tobetter rankings in search results, higherclick-through rates, and ultimatelymore traffic.

This method also helps to identify and close content gaps, i.e., to recognize topics that have not yet been sufficiently covered in your own content but areofinterest to yourtarget audience.

To perform a WDF*IDF analysis, you first need a selection of documents to serve as references, often thetop resultsfroma search enginefora specific keyword. Next, you analyze howoften each wordappearsinthedocument to be optimized (WDF) and how often these wordsappearon average in thereference collection (IDF).

Special SEO tools such as Ryte or Sistrix canautomate this analysisandoffer a simple user interface for interpreting the data. The analysis results in a list of words that should either be emphasized more or reduced in order to optimize the relevance and readability of the text.

• WDFIDF tool:Aversion limited to three free queries per day.

• Keyword Tool Dominator:Hasa limited free version that allows for simple keyword frequency analysis.

• SEOlyze(30 days free):Offersbasic WDF*IDF analysis as part of its services.

• SEO Power Suite:Offersa free version with some features.