What Fractional Factorial is: A multivariate testing method that only tests a certain number of variations for multiple elements of a website. Testing platforms have an algorithm that will choose the best variations of the different elements to test. This is sometimes called a partial factorial test.
What Fractional Factorial is not: Full factorial, a multivariate testing method where each every single variation of a website is tested.
Why Fractional Factorial matters: This testing method allows a company to achieve significance faster while testing multiple elements then running a full factorial test. For most companies, fractional factorial is the only multivariate method that they can use.
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