Testing your ADSENSE Ads to choose which is the best Ad

How do you decide WHICH AD performs the best on your Web Site. One of the best strategies for using Google Adsense to monetize your websites is to find out which Ad performs the best return per click and use that ad. to do this you have to have a way to test different ads. To do this one of the easiest ways is to ad code to your site that allows you to rotate an ad randomly and see which one comes out ahead at the end of the day.
SO if you have two ads each with their own custom channel and you put them in a rotating script which shows each ad to users an equal amount of time you may be able to determine which google adsense ad performs better. Here is the code to do it.
<!-- google ads -->
        <script type="text/javascript">
        var random_number = Math.random();
        if (random_number < .5)
        {
        <!--
google_ad_client = "ca-pub-XXXXXXXXXXXXXX";
/* ADS-TEST1 */
google_ad_slot = "8352240308";
google_ad_width = 336;
google_ad_height = 280;
//-->
}else{
<!--
google_ad_client = "ca-pub-XXXXXXXXXXXXXX";
/* ADS-TEST2 */
google_ad_slot = "3075656559";
google_ad_width = 300;
google_ad_height = 250;
//-->
}
</script>

        <!-- google ads -->
This code rotates two different ads with different channels based on a 50/50 randomness. the rotation code is in blue, the RED are elements that are specific to your account and custom channels. Here are my results from Adsense.

 AD CHANNEL                             [Vies]   [Clicks]   [CTR]   [CPC]   [RPM]  [Earnings]

ADS-TEST1	AdSense for Content	(2,038)	(5)	(0.25%)	($0.22)	($0.54)	($1.10)

ADS-TEST2

AdSense for Content

(2,162)

(2)

(0.09%)

($1.30)

($1.20)

($2.59)

Some simple analysis can now show that two things happened here. 1. Test Ad #1 got more clicks BUT Test Ad #2 paid more PER CLICK (CPC).