Comment on SEO AdSense WordPress Theme by Paul Zagoridis.
A feature I’d love to see is the ability to A/B test AdSense ads.
I’ve used both javascript and PHP methods to serve one ad 50% and another 50% of the time. Those percentages can be changed. I prefer PHP methods as the show source reveals javascript methods.
When combined with tracking custom channels (in adsense) I’ve found that text ads earn 200% more than image ads of the same size on some sites. I a/b test for 250 to 1000 impressions of each ad. 250 is only enough if there is overwhelming evidence.
Trickier is to a/b test competing ad units of different size or even different layouts altogether. I can’t think of a good way to test that without breaking a theme. Radical design changes would probably require a/b testing with different themes.
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I think the most elegant way will end up being something that serves two different versions of the template, possibly a cache or static page script.
So it would live outside the template, you are right about a lot of code …
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