Can i calculate CTR from getKeywordEstimate call of Adword API,
which has removed CTR and impressiond field from the API call ?

It reutrns me
[lowerAveragePosition]
[upperAveragePosition]
[estimatedAveragePosition]
[lowerCostPerClick]
[upperCostPerClick]
[estimatedCostPerClick]
[lowerClicksPerDay]
[upperClicksPerDay]
[estimatedClicksPerDay]
[estimatedCostPerDay]

Thanks a lot for the detailed explanation! You really know your stuff .

Inside the webpage that Joshua referred to: http://adwords.google.com/support/bin/answer.py?hl=en&answer=10215 , it lists 2 types of Quality Score, and I guess you were referring to the first one (i.e: the one for determining minimum bids)?

From your experience do you think that the history factor is set in certain increments such as 7 days, 30 days, 60 days, etc. So, every time you go beyond that time increment it will help increase your ad positioning? Or do you think that it could possibly be calculated relative to your competition?

Also, what do you think Google calculates the history factor for? The campaign as a whole? Each text ad? Each keyword?

I was confused about how the quality scored played a role in your actual ad position for a long time. For speaking with Perry Marshall about this, I can tell you confidently that your ad position is determined by:

CTR X (Bid Price) x (a history factor)

I don’t care what Google claims, don’t expect them to publish this information. This is the best information I have on the subject.

Also, I believe that Google includes CTR is part of the quality score, and incidentally the only part (along with bid price and history) that effects your ad position.

I have 3 Google accounts and over 27 active campaigns, and have spend over a million dollar on Google this year alone, so trust me on this.

“Remember your quality score ONLY effects your minimum bids & NOT your ad position (except for placement in the pink sponsored link bar)”

Unless I’m misunderstanding your statement, I believe you may be in error:

“Quality Score influences your ads’ position on Google and the Google Network. It also partly determines your keywords’ minimum bids. In general, the higher your Quality Score, the better your ad position and the lower your minimum bids.”

From http://adwords.google.com/support/bin/answer.py?hl=en&answer=10215:

Nice post.

You might also want to point out that the formula for calculating Ad Rank on the Content Network is a little bit different than for the Search Network. The differences are explained by Google here.

And please don’t perpetuate the myth that “if you have double the CTR you pay 1/2 the bid price for the same ad position”, because it’s not true. Yes, doubling your CTR will improve the QS used for Ad Ranking, but it will not actually double that QS because there many are other factors involved besides the CTR. If you want to “pay 1/2 the bid price for the same ad position”, you have to double the quality of ALL of the factors in the QS rather than just the CTR.