Sampling Bias

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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...

by Tim Ash • Published August 5, 2009
Sampling Bias • Experiments • Statistics • Confidence Level • Landing Page • Data Collection • Internet • Overgeneralization • Mcenery Convention Center • Sequential Testing
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...

by Tim Ash • Published June 25, 2008
Usability Testing • Focus Groups • Customer Service • Web Site • Discussion Forums • Eye-Tracking • Search Function • Usability • Landing Page