I am now trying to understand the core points of QS to optimize my ad campaigns the right way, so I have gone through a lot of articles but still have a lot of issues that are not clear to me. For instance:
How many impressions are enough for keywords to achieve Google Adwords impressions threshold?
Google says that it is a couple of thousands, however, what about long-tail keywords with 10 queries/month on average? Does the same algorithm apply for these keywords as well?
Re: Keywords QS
Hi Anatoliy, great question but unfortunately there are no (publicly available) answers. We certainly know that at some point the Quality Score of a given Keyword can change quite suddenly, which strongly suggests it has passed some sort of "marker" in terms of clicks and/or impressions, but what that figure is, and how Google treats longer-tail Keywords is not public knowledge.
Re: Keywords QS
Jon is right on the money with this one. There are a couple of things though that may help you better understand what is going on. Firstly, just because your Keyword has nto reached this threshold does not mean it does not have a QS. You will see a QS in your account from the get go, this QS is calculated based on the average of what other advertisers are achieving and this is influenced by account history.
So you will be given a QS that you can see from the get go. Another thing to remember is that QS is calculated every single time your Keyword enters the auction and it assigned a QS based on the current situation,only once this scenarios has acquired enough of a 'true' reflection of what your QS be will that threshold be reached.
To answer your other question, regarding long tail keywords. The answer is yes, the same algorithm is given to the long tail keywords.
Hope this helps!
To answer the question about someone having done an experiment, that would not necessarily be applicable to you. The reason being is that the number of required impression seems to be variable, and this is all dependant on the variation between your calculated QS over the auctions.
If you are consistently being awarded a 7/8 QS in the auctions you enter the you are likely to see this number reflected on your account much sooner than if you were receiving QS of 3-9 during those same auctions.
On top of that, there is no sure way to tell when you have reached that exact point. You will on occasion see a large jump in your QS, and it is then safe to assume that you have reached that threshold. But that is not always the case, often you see slight shifts or QS remains the same and you have no way of telling if you have reached the threshold or not. So an experiment such as the one you describe would actually not be able to tell you any kind of useful information ceteris paribus.
This is a combination of the two. Google does not disclose specifics. But the "common knowledge" is that for a campaign, to gain enough statistics, that CTR (the major component of QS) is factored into your campaign's performance, it's either 1000 impressions per keyword, or a period of time - which Google does not disclose its length.
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Re: Keywords QS