Text analysis Tool: WDF*IDF - Within Document Freqeuncy x Inverse Document Frequency / tools?

[inlinear]

Checking Keyword-density is just to primitive... what is your recommendation for the subject WDFPIDF?
The SEO-Tool onpage.org (german) offers an interesting tool to analyse your text. But there are differences between languages and factors like proximities, synonyms etc. What are your experiences?

• tools?
• does mOz develop a tool for this? This would be a nice Feature for the On-Page Grader!

best regards,
Holger

[Chris.Menke]

My personal feeling about term frequencies on pages is that it's like chasing your tail.  Whatever way Google uses term frequency measurements is so wrapped up with a bunch of other machine learning algorithms that you couldn't possibly come to any real conclusions about its employment as a stand alone factor.

It's time to jump off the frequency bandwagon. As Matt Cutts says, Google is moving from "strings to things"--meaning a more holistic understanding of the page is where things are going.