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A WebmasterWorld thread asks if one's ad position affects the CTR value in the quality score. In short, you do not have to worry to much, Google thought of this.
AdWordsAdvisor said:
CTR is normalized for position when we are calculating your quality score.
Exactly how is it normalized? Well, we are not too sure, but it is.
Forum discussion WebmasterWorld.
Comments:
Andrew Goodman
12/22/2006 03:50 am
One thing to keep in mind is they probably look at the industry sector (or relative CTR's).