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Would that just be some visitors having 100% CTR, and the rest having a 0% CTR?
An average. So you might have a 30% CTR per visitor.
For me, I'm more concerned about how many visitors eventually click on an ad, rather than a CTR per page.
This could be helpful for websites with forums. Generally forums receive a lower CTR per page, but knowing the average CTR per visitor could help the webmaster develop certain paths which would encourage an eventual click.
Divide the number of clicks you have in one day by the numbers of visits you have had on the same day. (Most visitors won't click on more than one ad during a single visit.)
So, if you had 25 clicks in one day and 500 visits.
Your average CTR for visits would be 25 divided by 500. (5%)
You will get the most accurate numbers by using the number of visits rather than the number of unique visitors, especially if your site sees a lot of repeat visits.
Sticky me. There is a web counter that will tell you that info.