Central Composite Design Software Free Download
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How to Use Central Composite Design Software for Free
Central composite design (CCD) is a popular method for optimizing response surfaces in experiments involving multiple factors. CCD allows you to estimate the effects of linear, quadratic, and interaction terms of the factors on the response variable. CCD also has the advantage of being sequential, meaning that you can add more runs to the design as needed.
However, CCD requires five levels of each factor, which can increase the number of runs and the cost of the experiment. Moreover, not all software packages support CCD or offer a free trial version. In this article, we will show you how to use NCSS, a statistical software that provides a free trial version and supports various types of experimental designs, including CCD.
Steps to Use NCSS for CCD
Download and install the free trial version of NCSS from here. The trial version is valid for 30 days and has no limitations on the features or data sets.
Launch NCSS and click on the Design tab. Then click on Response Surface Designs under DOE.
Select Central Composite Design from the list of available designs.
Enter the number of factors and the number of center points in the corresponding boxes. You can also add categorical factors if needed.
Click on Options and choose the type of CCD you want to create. You can choose between rotatable, orthogonal, face-centered, or user-specified alpha values. Alpha is the distance of the axial points from the center of the design.
Click on Design Layout to see the generated design matrix. You can also modify the factor names, levels, and units if desired.
Click on Run Order and choose a randomization method for your design. You can also block your design if you have any nuisance factors that affect your response.
Click on Reports to see a summary of your design properties, such as resolution, orthogonality, rotatability, and variance inflation factors.
Click on Export and choose a format to save your design. You can export your design as an Excel file, a text file, or a data set within NCSS.
Conduct your experiment according to your design and collect your response data.
Import your data into NCSS and click on Analysis tab. Then click on Response Surface Regression under Regression.
Select your response variable and your factor variables from the list of available variables.
Click on Model and choose a quadratic model for your analysis. You can also test for lack of fit and include categorical factors if needed.
Click on Reports and select the output you want to see. You can view the regression coefficients, ANOVA table, model summary statistics, residual plots, contour plots, surface plots, optimization plots, and prediction intervals.
Interpret your results and draw conclusions about your experiment.
Conclusion
In this article, we showed you how to use NCSS for free to create and analyze a central composite design. NCSS is a powerful and user-friendly software that supports various types of experimental designs and statistical analyses. You can download the free trial version from here and explore its features for 30 days. We hope this article was helpful and informative for you. ec8f644aee