Why Use Designed Factorial Experiments?

One-Factor-at-a-Time Versus Designed Experiments (site broke link so I removed it -when will people learn how to manage web content?) by Veronica Czitrom:

The advantages of designed experiments over [One Factor at a Time] OFAT experiments are illustrated using three real engineering OFAT experiments, and showing how in each case a designed experiment would have been better. This topic is important because many scientists and engineers continue to perform OFAT experiments.

I still remember, as a child, asking what my father was going to be teaching the company he was going to consult with for a few days. He said he was going to teach them about using designed factorial experiments. I said, but you explained that to me and I am just a kid, how can you be teaching adults that? Didn’t they learn it in school? The article is a good introduction to the idea of why one factor at a time experiments are an ineffective way to learn.

Related: Design of Experiments articlesStatistics for Experimenters (2nd Edition)Design of Experiments blog posts

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