# CPM: How many impressions before you make changes to the ad?

8 replies
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I'm in the process of running a banner on a ad-network that only has CPM. How many impressions should I allow before I make changes to the ad during the test phase?

Thank you
• anyone?

maybe....
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Gone Fishing....
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• Everyone has a different number. Some say 1,000 others 20,000, others 10,000. It's up to you. I typically by the amount spent per ad because the bottomline is money.

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• I go 7,000 to 10,000 on POF. But I also go off the amount spent vs. offer pay out many times.
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•  Originally Posted by TheNewGuy2010 I'm in the process of running a banner on a ad-network that only has CPM. How many impressions should I allow before I make changes to the ad during the test phase? Thank you
I would base it off of the amount spent opposed to number of impressions
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• Set a GOAL CTR then use this:

t = (CTR - GOAL) / (SQRT(CTR*(1-CTR)/IMP))

Then look up in a t-table.
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•  Originally Posted by DaveWarrior Set a GOAL CTR then use this: t = (CTR - GOAL) / (SQRT(CTR*(1-CTR)/IMP)) Then look up in a t-table.
What is "t" in this formula?
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•  Originally Posted by gn3man What is "t" in this formula?
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• I give each banner 10,000 impressions. Then depending on the conversion and ctr I cut them.
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