What is Taguchi? How does it relate to testing?

14 02 2008
New URL testingblog.widemile.com
the Taguchi method

Multivariate testing is a buzz word these days, but the buzzword of multivariate testing seems to be Taguchi. However, that term is being abused. Do you know what Taguchi really means? I wasn’t even positive, so to get some background, I did some research and talked with Vladimir (Widemile’s Chief Scientist).

The name and method comes from Genichi Taguchi. His method, also known as Robust Design, attempted to improve product manufacturing quality. Therefore it falls into an area of engineering called Quality Engineering.

Does this sound aligned with website testing? Not really, and this is the problem of using the term Taguchi with web site testing. The goals of manufacturing and the goals of a website are not the same.

What most people are attempting to grasp when using the term Taguchi is fractional factorial test design. (I discussed this at length in my post about the difference between Widemile’s technology and Google Optimizer.) The Taguchi method uses a fractional factorial test design and is under the umbrella of fractional factorial testing but is not the only or best fractional factorial method. In fact, even within manufacturing, the Taguchi method was the inspiration for many new techniques but many statisticians find it flawed.*

It is important to differentiate the Taguchi method from fractional factorial test design since one is a basis for manufacturing while the other is purely related to design of experiments. You need to ensure that the math and science behind your testing is based on methods that have the end goal of optimizing your website only. So if your testing tool uses the Taguchi method for testing, you better ask what that really means.

So does Widemile use Taguchi? We don’t use the Taguchi method, however do use fractional factorial test design. I like to say that our platform goes beyond Taguchi because it was specifically made for optimizing web content.

Don’t get sucked into the Taguchi method, it is just a buzzword used by your fellow marketers. Just because the technology doesn’t use Taguchi, doesn’t mean you should count it out.

*Read more after the jump for Vladimir’s explanation of the Taguchi method and its criticisms
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