AB TestingAB testing allows you to test which is the better out of 2 diferent layouts. For example you can test which of 2 different adsense ad colors has the best clickthrough rate. What is needed is some code whereby 50% of the time one ad is shown and 50% of the time the other ad is shown. Each ad must be set up with it's own tracking. Then give the ads a few weeks and compare the clickthrough rates of the 2 ads. If one is clearly the winner then keep that ad as your main ad or continue testing that ad against a new variation.
AB testing can also be used to compare signup forms for news letters or any call per action.
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