Here's a new script to find the best text for new ads using an n-gram analysis - Search Engine Land

Ad text optimization is a great example of an area of PPC automation where the machines won’t get very far without the help of PPC pros. Machines need ongoing support from humans to deliver results. Automations can easily pick winning and losing ads through statistical analysis and do even more sophisticated things like predicting the best ad to show to individual users—  they do this based on patterns discerned by machine learning models. However without compelling pieces of ad creative to experiment with in the first place, the machines won’t get very far...

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