Comparison of Taguchi Method of Analyzing Robust Parameter Design and Graphical Approach

Abstract

Taguchi's method/approach of analyzing data from Robust Parameter Design (RPD) has received different critisims, the most controversial being the choice of measure of performance, the Signal-To-Noise Ratio (SNR). The wrong choice this measure of performance, SNR, can lead to cross-talk (confusion) of factors affecting Sensitivity (Mean) and those affecting Dispersion. An example of right choice of SNR is given and also when SNR is wrongly chosen. The graphical method through gamma-plot gives the appropriate choice of SNR and consequently gives a clear cut among factors affecting Sensitivity and those affecting Dispersion.