How can WDF*IDF tools be used?

In the SEO world the WDF*IDF analysis is on everyone’s lips. All of a sudden keyword densities are a thing of the past, it is all about the weighting of terms within a document compared with the complete site. Now among many a site operator the question arises as to whether they can really implement the tools at disposal for analysis. Do the tools provide information about the number of necessarily to be mentioned words, do they rather set the direction or do they represent the guarantee key for top ranking?

Digesting the new know-how

Those searching the World Wide Web for a certain search phrase with a WDF*IDF tool receive a diagram which lists various terms in the horizontal bar and enters the weighting in the vertical bar. Many tools depict the average frequency of the words as column within the diagram, the maximum frequency by a line. In the evaluation of the diagram it is now quite easy to find out which words are truly linked to the search phrase selected. It is, however, important to make a pre-selection in the analysis and not to apply the tools to the entire mass of search results but to the highly ranked results.

Working out the sense

Nevertheless, there are already considerable limitations at this point. The newly identified facets may indeed be applied without qualification to long texts however, they are hardly suitable for short texts. The reason is quite clear: If the diagram provides a total of 25 terms which are utilised at an average frequency in connection with the search term, it is impossible to process every term in a text of some 300 words. In the latter case the readability would suffer considerably as if the text should be written at a keyword density of 15 per cent. This means that in the case of short texts it would be better to set a focus.


It may generally be accepted to consider the results of the analysis as a guide. At a glance the relevant sub keys set by competitors can be quickly detected. Finding new keywords is therefore considerably simplified by the analysis.

A further possibility to benefit from the WDF*IDF analysis is to compare the already existing texts with the current excellent results. Particularly in the course of re-editing a homepage, improvement potential can be found quickly. If the text has been generated some months or even years ago, the market may have changed considerably in the meantime, it is thus sensible to adapt the text.

The tools available for the analysis are therefore perfectly appropriate

  • to collect keyword changes,
  • to find synonyms,
  • to filter weighting,
  • to compare existing texts,
  • to determine term weighting.

Last but not least the tools can really be of assistance to work out a topic to investigate. Particularly by the plurality of the words in connection with the search phrase a focus can be set by which the text becomes interesting and is valuable for the reader. The bonus then crops up with no further intervention when, by including the words filtered by the analysis, the text is automatically ranked higher in the search engines.