S/N ratio is the most significant and useful parameter in taking into account of target and variation in comparing two sets of samples, when compared comparing the mean alone.
Taguchi method of DoE, uses S/N ratio in ANNOVA calculations.
In an experiment if one observes for a given Quality characteristic say "Nominal is Better" or "Bigger is Better" S/N values as negative, what is the interpretation?
Hello
Let me give you one experimental Quality Characteristic 'Nominal is Better'.
I have a target value. The significant control factor and its optimum level need to be interpreted from results.
Hope I did clarify for one...
3 Control Factors, 3 Noise Factors, 3 Levels... L9 OA...
One Control Factor contribution is very high...
I understand there is a ALIASING & CONFOUNDING EFFECT in resolution III Fractional Factorial design... But this is orthogonal array... Unfortunately I can not share the data... Thank you for your answers and time pl.
Dear Colleague,
no matter the sign, you just take the higher signal.
This comes from working with the logarithm of an expression and sign.
Thus the sign is irrelevant in this particular case and has no special meaning, outside the signal theory.
Dear Mr. Pedro, Thank you. Kind of you for your care & time... Useful. Kind Regards, Ramanan
Dear Mr Fausto Please disregard the negative vote for your answer. I mistook the -ve vote for a down arrow to see more content of your answer.
hello, the article "Taguchi Parameter Design: A Panel Discussion Technometrics
Volume 34, Issue 2, 1992 "shows the limitations of Taguchi method.
Hello Alessio
Thank you. Can you share this article or point to a link to download.
Kindest Regards
Ramanan
http://www.jstor.org/stable/1269231
http://www.tandfonline.com/doi/abs/10.1080/00401706.1992.10484904#preview
I used Taguchi design in my last work and I explain that step by step in my article. You can see my new publication in below link.
http://www.tandfonline.com/doi/abs/10.1080/19443994.2015.1092893?journalCode=tdwt20
You can find the article “Shahavi M. H., Hosseini M., Jahanshahi M., Meyer R. L. and Najafpour G. D. (2015) Clove oil nanoemulsion as an effective antibacterial agent: Taguchi optimization. Desalination and water treatment, Taylor & Francis, Impact Factor: 1.173, ISSN: 1944-3994, DOI: 10.1080/19443994.2015.1092893” through below Researchgate link.
Article Clove oil nanoemulsion as an effective antibacterial agent: ...
No issue with negative sign of SN ratios. If formula applied corrected, no need to worry about.
you can take help from " Design of Experiments and Minitab " youtube channel
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