One thing not mentioned here is that exact matches will have a higher quality score than broad matches, so don't just rely on broad match keywords - include some exact match keywords for common variations.
There's actually quite a lot of little details that get speculated on in SEM. The fact is, until you test it yourself, you won't know for sure. One interesting thing about QS for phrase and broad is that the QS you see is not the real QS; it is only the QS for queries that match exactly to your keyword. The real QS is weighted appropriately, based on impression distribution.
I also doubt that quality score takes only integral values.
QS as reported in the interface is a bit like tool bar page rank; it can tell you if you're doing really well or really badly but at the end of the day your competitors probably have a load of 7's too
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One thing not mentioned here is that exact matches will have a higher quality score than broad matches, so don't just rely on broad match keywords - include some exact match keywords for common variations.
There's actually quite a lot of little details that get speculated on in SEM. The fact is, until you test it yourself, you won't know for sure. One interesting thing about QS for phrase and broad is that the QS you see is not the real QS; it is only the QS for queries that match exactly to your keyword. The real QS is weighted appropriately, based on impression distribution.
I also doubt that quality score takes only integral values.
QS as reported in the interface is a bit like tool bar page rank; it can tell you if you're doing really well or really badly but at the end of the day your competitors probably have a load of 7's too
This was directly from a Google Adwords rep.
Google AdWords reps are far from authoritative.
I thought QS was independent of match type and account wide for that KW...
This is definitely not the case; I've seen different QS on different match types for the same keyword.
Yep - just looked in my account. Usually +/- 1 though. Have you seen bigger variations?
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