Statistical Significance for Impressions
How many impressions before the CTR becomes 95% accurate?
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hypothetically ...
500 clicks (CTR is statistically valid [1,000+ is better])
so what is the impressions CTR and where is it? Banners on mediocre websites or PPC ads in Google?
100 impressions in Google Ads (AdWords new name) may produce 3-7 or more click-throughs.

banner impressions 50000*0.00015 =7.50000
340000*.00150=510.00000

It might take 340K banners 510 CTR and 10 - 50 payable events ;) (worst case scenario)

^^ what math do you use?

If you use a Bayesian calculator it will depend on how many clicks you get on those impressions. Comparing 2 ads... 500 impressions on each ad... if one ad gets 1 click and the other 5 clicks.... it will be 95% accurate the one with 5 clicks is better.

Thank you. 

So after getting about 500 - 1000 impressions the CTR should be about 95% accurate?

Knock yourself out :D
NO, clicks ON impressions
PPC or some other display and what quality is the media?

You cannot compare ALL impressions from any source ...

Banners or pop ads you may need a A LOT of CPM to get 500 - 1000 clicks.
Unless, bots and network unfiltered garbage 'counts'.
Garbage traffic makes real stats NEAR impossible.

Bottom line is always customer acquisition cost per media/campaign.
That is the ONLY stat that matters when you go to the bank ;)
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Thank you.

So after getting about 500 - 1000 impressions the CTR should be about 95% accurate?
As I said, it depends on how many clicks you get on those impressions.

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