Adsense A/B testing, or split testing, is the practice of having two different ad designs shifting, so you can tell which ad design is best for your site.

I’ve done this on all my sites and have so far been able to increase my adsense income by 75% but this is a practice that doesn’t end, when your first two ads have had a ~2000-3000 page views it’s time to pick the winner and THEN making a new ad design to compete with your winner. Always try to beat your winning ad, just as you would with your PPC campaigns.

When A/B testing you should remember this:
Only change one thing in the ad for each test. Do not make to completely different ads, as you’ll not be able to see, which of the changes are helping you.

It’s really easy to A/B test with adsense and it’s fully allowed to split test your ads with google adsense. The way to do it in practice is to make two adsense designs and adding them to two channels in your adsense account, so you will be able to see the difference between the two, in terms of CTR. Then you put them in to a simple java script. Googles own example looks like this:

<script type=”text/javascript”>
var random_number = Math.random();
if (random_number < .5){
//your first ad unit code goes here
} else {
//your second ad unit code goes here
}
</script>
<script type=”text/javascript” src=”http://pagead2.googlesyndication.com/pagead/show_ads.js”></script>

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