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What is quality score and how to use it in PPC

Search Engine Land

Google calculates quality score based on the combined performance of three components: Expected click-through rate (CTR) : The anticipated CTR of the ad against what the ad platform considers similar ads. Optimizing for good CTR is more important than optimizing for good expected CTR. 6.308888889 Maine 5.411764706 65.88

CTR 91
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3 Lessons in Measuring Marketing Success [Marketing Update]

Hubspot

They were also able to determine that "text-based emails from an account manager generated 10-times greater a response than nurturing emails that used more HTML.". Click-through rate (CTR) should continue to be used as a diagnostic metric for direct response initiatives; however, it should not be used as a primary metric.".

CTR 55