Quality sore of a keyword mainly depends on the key term relavance. How much is your ad relevant to the keyword which is entered as a serch term is more important. In Adwords help center I came accross a question “What is a Quality score and how is it calculated?” from which the main factors influencing Quality score are

Performance variables like keyword clickthrough rate (CTR), ad text relevance, overall historical keyword performance with Google, and even the user experience on the landing page or site associated with an ad. We put all of these factors and more together to create a Quality Score

And the formula used for the calculation of Quality score was also given.

Quality Score = (keyword’s CTR, ad text relevance, keyword relevance, landing page relevance)*

*Where the interactions between the Quality Score variables change as we continue to refine how to measure and define quality in AdWords.

These factors according to Google affects your Quality score. The quality score is likely to be changed everytime when the relavance factors are affected. Know how your Quality score is used. Eventhough the formula changes often these factors will always have a impact in your Google rankings.
Mark

Tags : Quality Score, Google Adwords, Quality score calculation, Keyword relevance

This entry was posted on Wednesday, February 28th, 2007 at 9:54 am and is filed under Search Engine Optimization, Search Engine Marketing, Google AdWords, Google. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.