In my campaign, I had one keyword which had an alltime 27 clicks with 11,412impressions yielding a 0.23% CTR. Horrible as my other keywords no where received this many impressions! This is dragging my CTR rate for the other keywords. I've been running this camaign for 3 months now. My other keywords are good and I'm getting between 2-28% CTR on the others. But my campaign CTR is now 1.06% Now that I see it is a bad keyword, I purged it from my campaign Do you think it's best to delete this entire campaign and restart a NEW campaign to start with a fresh slate and have better statistics? Or is this considered a bad idea and can have ramifications?
The quality Score is per keyword, not adgroup or campaign - each keyword do not affect each other, You already did something wrong by deleting the poor performing keyword. Also if you delete the entire campaign will not fresh the keywords Quality Score.
I assume that those numbers don't include the content network? If they do, then that's not the clickthrough rate that the Quality Score uses - the Search clickthrough rate is what you should be looking at...
If you have an old campaigns with a poor quality score its tough to remedy it. if the account has a very bad history and low quality scores, it may be better to close that account and start from scratch rather than spend an exorbitant amount of time reviving an old account. In this instance, Google uses your account history against you.
actually there is an account quality score. it was never confirmed until early this year... http://www.ewhisper.net/blog/low-quality-keywords-can-lower-other-keywords-quality-scores/