Billy's Twitter

My boss and director of optimization, Frans Keylard, got interviewed at SES San Jose (video) http://is.gd/1Q3Y >> 2008/08/22

Google updates Website Optimizer. I'm scared that people will mess up their test validity with the new experiment pruner http://is.gd/1NFt >> 2008/08/21

Anyone else lose a ton of Feedburner subscribers overnight? I lost 81! Over half my subscribers?! >> 2008/08/15

Going to SES San Jose? My boss, Frans, will be on the Landing Page Utopia: Expert Roundtable. He knows more about testing than anyone else! >> 2008/08/13

Been watching the gmail outtage on summize (twitter search). I always look to it for current and tech events now. http://is.gd/1nwi >> 2008/08/11

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Interactions

By Billy | May 23, 2008

I’ve written an extended definition for interactions in preparation for a long post about full and fractional factorial. Understanding interactions is a critical part to understanding full and fractional factorial also. I look forward to clearing up some misconceptions about fractional factorial test design. Hopefully I’ll have the post done next week.