To compare the quadratic and special cubic models, it was necessary
from the start to obtain both theoretical models.
The Design-Expert (Stat-Ease, Inc., Minneapolis) and Statistical
(StatSoft, Inc., Tulsa) software packages were used to generate designs,
fit the response surface model to the experimental data, and draw
response surface figures.
To compare the quadratic and special cubic models, it was necessaryfrom the start to obtain both theoretical models.The Design-Expert (Stat-Ease, Inc., Minneapolis) and Statistical(StatSoft, Inc., Tulsa) software packages were used to generate designs,fit the response surface model to the experimental data, and drawresponse surface figures.
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