I recently added a new campaign with new keywords and new text ads, to my account. I had these questions; How does Google attribute QS to new keywords in new campaigns with new ads? Does the QS of my older keywords affect the QS of the new ones?
I know that expected CTR, ad relevance and landing landing page experience are part of the algorythm for keywords QS. So, I decided to search for Account Level Quality Score. That’s what I found. The account level quality score was supposed to be an average of your overall keywords quality score (Google denied the existance of such metric). Google reported in their whitepaper on quality score that "There is no such thing as ad group-level, campaign-level or account-level Quality Score.", but also reported that "Instead of measuring new keywords from scratch, we start with info about related ads and landing pages you already have.", which may indicate that your actual performance affect new keywords performance. In 2015, WordStream posted "Sorry, Google, Account-Level Quality Score Still Exists", an article unfortunately without actual research/proof…, saying that the account level quality score exist but is hidden.
I’m still monitoring KWs QS (I’m not deleting KWs based on QS, and if you’re reading this and you’re new to Adwords, I don’t recommend this behavior), but I’m curious. I would like to know if you have recent information on this topic.
Thank you !