Performance Measures Independent of Adjustment: an Explanation and Extension of Taguchi’s Signal-To-Noise Ratios
When the Ina Tile Company of Japan found that the uneven temperature profile of its kilns was causing unacceptable variation in tile size, it could have attempted to solve the problem with expensive modification of the kilns. Instead, it chose to make an inexpensive change in the settings of the tile design parameters to reduce sensitivity to temperature variation. Using a statistically planned experiment the company found that increasing the lime content of the clay from 1% to 5% reduced the tile size variation by a factor of 10 (see Taguchi and Wu).
KeywordsParameter Design Loss Function Adjustment Parameter Expected Loss Gear Ratio
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