CTR is one factor in ranking

But over how long time do they get the CTR?

[johannes]

Ranking is calculated by multiplying CTR and maximum CPC. But over how long time do they get the average CTR for calculating the ranking? A month, a day? From my experience it's a month or so. Does someone has more detailed opinions about this?

I've also found this:
I had an ad that ranked around #5 for a rather popular keyword. Then I had it paused for 3 or 4 months. When I put it back it ranked #1 for that keyword. As I see it, CTR generally decrease over time, as more competitors come to adwords. But my ad's CTR didn't decrease as it was paused.

[aravindgp]

Hi

If I understand what you are saying....adwords influence PageRank.

Do clarify on this?It sounds interesting tip if it works.But otherwise if I am like somebody jumping in without any proper grounding do over look my fallacy.

Aravind

[johannes]

aravindgp,

No I mean the ranking of the adword ads in the right margin.

[PeiteTaOla]

I don't have any data on this, only a thought to add.

One possibility is to count the CTR since the Ad is created. If you edit the Ad, the CTR resets. The problem with this would be that an Ad could have a high CTR when it was alone and now have a low CTR as it is together with more interesting Ads. In the short term it would be unfair to new Ads to count the CTR from the beginning. The same could happen if the user had paused his campaign when he had a high CTR, as the case that johannes mentions. If Google was trying to avoid that, then it would reset the CTR when an Ad is paused and reactivated.