A / B solutions for testing and statistics

I searched for a good test structure for several months without finding anything, so I just created my own.

This is what I want to do:
 - track arbitrary behavior (for example, the number of photos viewed, the number of comments posted)
 - track the correlation between arbitrary variables and these behavior
(for example, how do different versions of this query affect the average number of photos viewed?)

Such a thing should be an essential part of agile development. What is there? I know that Google Website Optimizer is one of the answers, but you can track behavior that ends on a single Success page.

It would be great to have a plugin that can work inside your code (Rails in my case) and serve in a good hosting service with beautiful graphics ...

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(, , ) ( x , , , ..). , , , - Google , , , , Google Analytics.

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