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Sampling Bias

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  1. Lies, Damned Lies, and Statistics in Landing Page Optimization

    Another type of sampling bias can be introduced by sequential testing. Even if you run your tests by splitting the available traffic and showing different versions of your site design in parallel, you may still run into biased sampling issues...

  2. Uncovering Site Problems for Landing Page Optimization, Part 2

    Of course, more outgoing and assertive participants can bias focus groups, and the moderator's influence is important. Randomly sampling a pool of people from your intended target audience is better. Today, we'll continue the discussion with some...