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A comment on A Beginner’s Guide to Pay-Per-Click: Quality Score. Parent comment

Re:A Beginner’s Guide to Pay-Per-Click: Quality Score by suking on Wednesday May 25, 2011 @04:53PM (#2585513)
Yep - just looked in my account. Usually +/- 1 though. Have you seen bigger variations?
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Re:A Beginner’s Guide to Pay-Per-Click: Quality Score by rfergie on Wednesday May 25, 2011 @05:18PM (#2585599)
Have seen exact on a 7 and broad on a 10.

Discussion about probable reasons why in the comments of http://www.rimmkaufman.com/rkgblog/2010/09/28/negative-keywo...

Because of some negative keyword trickery on the broad match version we decided it was a reflection of the account level QS

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