Optimization demonstration using Taguchi, Anova, Regression for performance and emission parameters

[@vikashkumar-cr7ee]

Hi there,
I can't see any optimisation option there.

[@RanjanKumar-ic6qe]

Dear Sir,
Thank your for this informative tutorial. But I have one question. Could you please tell me that after putting the regression equation of BTE, how the author is calculating the percentage error of 6.37???
Please reply...!