Evaluating an ad test is all about aggregated data. In the last edition of this series, I demonstrated how this can lead to the wrong conclusions by going just below the top level. Today we’ll take a look at the lowest level.Continue reading
Martin Roettgerding is the head of SEM at SEO/SEM agency Bloofusion Germany. On Twitter he goes by the name @bloomarty, and you can find him regularly on #ppcchat.