I stumbled across Jason Cohen’s blog a few weeks ago and have been reading a bit of it lately. He’s got a great article today about Statistical Significance in AdWords campaigns (or any PPC split test for that matter). A great quote from the article…
Because the AdWords “click-through rate” is dependant both on the number of clicks and the number of impressions, you must not use “click-through rate” to determine statistical significance. Only the raw number of clicks can be used in the formula.
Read the rest at A Smart Bear.
