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How often is CTR re-evaluated for bidding purposes?
Rank = CTR X bid - but how often does CTR get updated?
limitup

WebmasterWorld Senior Member 10+ Year Member



 
Msg#: 4418 posted 1:57 am on Jan 25, 2005 (gmt 0)

Title and meta pretty much says it all ...

As I understand it, your rank is a function of your CTR multiplied by your max bid. But exactly which CTR is used in this calculation? Is it the CTR for a particular term since the day you added it to your account, the CTR for that term over the past month, the past week, CTR from yesterday or?

 

NedProf

10+ Year Member



 
Msg#: 4418 posted 8:05 am on Jan 25, 2005 (gmt 0)

Limitup:
For as far I know the algorithm of AdWords is more complicated then you suggest. There's also a historical factor and a kind of correction factor for the position of the ad.

I think the CTR is the CTR over the last 1000 impressions and is continue calculated.

Tropical Island

WebmasterWorld Senior Member tropical_island us a WebmasterWorld Top Contributor of All Time 10+ Year Member



 
Msg#: 4418 posted 10:24 am on Jan 25, 2005 (gmt 0)

I would also assume that it is an on-going process which would explain the changing posistion of some ads during the course of the day.

limitup

WebmasterWorld Senior Member 10+ Year Member



 
Msg#: 4418 posted 5:38 pm on Jan 25, 2005 (gmt 0)

Can anyone confirm that it's the CTR over the last 1,000 impressions?

AdWordsAdvisor

WebmasterWorld Senior Member adwordsadvisor us a WebmasterWorld Top Contributor of All Time 10+ Year Member



 
Msg#: 4418 posted 6:11 pm on Jan 25, 2005 (gmt 0)

Can anyone confirm that it's the CTR over the last 1,000 impressions?

limitup, it is actually the all-time CTR for the keyword that matters, with the most recent 1000 impressions being weighted a bit more heavily.

One way to look at it: every single time a keyword has an impression, it's CTR has changed. The same is true if it has both an impression and a click. The AdWords system works on this basis, and weights to most recent 1000 impression more heavily. However, if you have a truly horrible 'most recent 1000', your past history, assuming it is at least reasonably strong, will save you.

AWA

suzyvirtual

10+ Year Member



 
Msg#: 4418 posted 10:11 pm on Jan 25, 2005 (gmt 0)

I just want to double check that this is for the keyword and not the ad. I recently experienced a massive drop in positions after changing some ads, while leaving the CPC the same.

NedProf

10+ Year Member



 
Msg#: 4418 posted 12:44 pm on Jan 26, 2005 (gmt 0)

The ads are related to the keywords. So bad ads -> bad CTR on the individual keywords -> lower rank on the individual keywords.

dmerton

5+ Year Member



 
Msg#: 4418 posted 3:44 pm on Jan 26, 2005 (gmt 0)

I have told, via Google support that CTR for the purpose of position is evaluted on the spot, every time, because it is constantly changing. Also, it is important to also know that it is your lifetime CTR, even if you delete and then add the term again, G remembers your CTR. Hope this helps.

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