Question

How to calculate the % contribution of process parameters in anova?

Answer 1

Answer:

The percent contribution is obtained by summing all the sum of squares term (SS) and then taking each individual SS and dividing by the total SS and multiplying by 100. This method of calculating percentage contribution is applicable for Plackett-Burman experimental design with or without selection of significant effects manually. For Plackett-Burman experimental design including center point, the method cannot calculate the values of the percent contribution of the factors as is shown by the Design Expert 9 software. In that case how to calculate % contribution values?