Click on the choices for Box-Behnken and 3-Level Factorial to see what these alternative designs look like. The picture shows the layout of the CCD for two factors.
The default selection is the Central Composite design, which will be used for this case study. Main Menu and Tool Bar Click on the Response Surface folder tab to show the designs available for RSM. The other route is via File, New Design (or associated associated Alt keys).
Take the quickest route to initiating a new design by clicking on the blank-sheet icon on the left of the toolbar. Eight runs: composed of six star (axial) points, plus two more more center points.ĭesign the Experiment Start the program by finding and double clicking clicking the Design-Expert Design-Expert software icon. Twelve runs: composed composed of eight factorial factorial points, plus four center points.
Ĭentral Composite Design for Three Factors Assume that the experiments will be conducted over a two-day period, in two blocks: 1. Response Surface Method (RSM) Tutorials 6-1 The three-factor layout layout for the CCD is pictured below. It’s well suited for fitting a quadratic surface, which usually works well for process optimization. Their names and levels can be seen in the following table.įactors for Response Response Surface Study Study You will study the chemical process with a standard RSM design called a central composite design (CCD). The experimenter chose three process process factors to study. Y1 - Conversion (% of reactants converted to product) The two most important responses, designated by the letter “Y”, are: The case study in this tutorial tutorial involves production production of a chemical. Call Stat-Ease or visit our website ((for a schedule. If you need in-depth education on RSM, we recommend recommend you attend our Response Surface Methods For Process Optimization workshop. You will find overviews in the on-line Help system. We will presume that you can handle the statistical statistical aspects of RSM. Many of these features are are used in the One Factor or Two-Level Factorial tutorials, so you will benefit by doing those first. Due to the specific nature of the case study, a number of features that could be helpful to you for RSM will not be exercised exercised in this tutorial. A case study provides a real-life feel to the exercise. 
This class of designs designs is aimed aimed at process optimization. This tutorial shows the use of Design-Expert software for response surface methodology (RSM). Section 6 – Response Surface Methods (RSM) Tutorials Response Surface Design and Analysis Analysis ®
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