Design-Expert® Software Version 9

Make breakthrough improvements to a product or a process with Design-Expert software. You can not only screen for vital factors, but also locate ideal process settings for top performance and discover optimal product formulations.  Easily view response surfaces from all angles with rotatable 3D plots. Set flags and explore contours on interactive 2D graphs; and use the numerical optimization function to find maximum desirability for dozens of responses simultaneously.
Try the free 45-day trial!

New Annual Network License—$1350 and up

Annual Network licenses include free updates, upgrades, and technical support as long as your license is current.

New Single-User Perpetual License—$1095
Single-User Perpetual licenses include free updates and technical support.  Future upgrades must be purchased.

Upgrade from an Earlier Version—$395 from v8 and $695 from v7.1 or earlier
Only Single-User Perpetual licenses can be upgraded online.

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Design-Expert® Software Version 9


Stat-Ease, Inc. welcomes you to version 9 of Design-Expert software (DX9) for design of experiments (DOE). Use this Windows®-based program to optimize your product or process. It provides many powerful statistical tools, such as:

  • Two-level factorial screening designs: Identify the vital factors that affect your process or product so you can make breakthrough improvements.
  • General factorial studies: Discover the best combination of categorical factors, such as source versus type of raw material supply.
  • Response surface methods (RSM): Find the optimal process settings to achieve peak performance.
  • Mixture design techniques: Discover the ideal recipe for your product formulation.
  • Combinations of process factors, mixture components, and categorical factors: Mix your cake (with different ingredients) and bake it too!

Your Design-Expert program offers rotatable 3D plots to easily view response surfaces from all angles. Use your mouse to set flags and explore the contours on interactive 2D graphs. Our numerical optimization function finds maximum desirability for dozens of responses simultaneously!

You'll find a wealth of statistical details within the program itself via various Help screens. Take advantage of this information gold mine that is literally at your fingertips. Also, do not overlook the helpful annotations provided on all reports.

For a helpful collection of checklists and "cheat sheets," see the Handbook for Experimenters. It's free to all registered users. Furthermore, for quick primers on the principles of design and analysis, we recommend you read the following two soft-cover books from Stat-Ease Principals Mark Anderson and Pat Whitcomb,  published by Productivity Press of New York city:

  • DOE Simplified: Practical Tools for Effective Experimentation,
  • RSM Simplified: Optimizing Processes Using Response Surface Methods for Design of Experiments.

Anderson and Whitcomb have also written a Primer on Mixture Design. It's posted free for all to read via the "I'm a Formulator" link on the Stat-Ease home page.

Go to for details and ordering information on the books listed above.


What's New

Those of you who've used previous versions of Design-Expert software will be impressed with the many improvements in version 9. Here are the highlights:

Hard-to-change factors handled via split plots

  • Two-level, general and optimal factorial split-plot designs: Make it far easier as a practical matter to experiment when some factors cannot be easily randomized.
  • Half-normal selection of effects from split-plot experiments with test matrices that are balanced and orthogonal: The vital effects, both whole-plot (created for the hard-to-change factors) and sub-plot (factors that can be run in random order), become apparent at a glance!
  • Power calculated for split plots versus the alternative of complete randomization: See how accommodation of hard-to-change factors degrades the ability to detect certain effects.

Other new design capabilities

  • Definitive screening designs: If you want to cull out the vital few from many numeric process factors, this fractional three-level DOE choice resolves main effects clear of any two-factor interactions and squared terms (see screen shot of correlation matrix - more on that later).
  • On the Factorial tab select a simple-sample design for mean-model only: Take advantage of powerful features in Design-Expert software for data characterization, diagnostics and graphics - for example with raw outputs from a process being run at steady-state.

Much-improved capabilities to confirm or verify model predictions

  • Entry fields for confirmation data and calculation of mean results: Makes it really easy to see if follow-up runs fall within the sample-size-adjusted prediction intervals.
  • Enter verification runs embedded within blocks as controls or appended to your completed design: Lend veracity to your ultimate model by these internal checks.
  • Verification points displayed on model graphs and raw residual diagnostics: See how closely these agree to what's predicted by your model.

New and more-informative graphics

  • Adjustably-tuned LOESS fit line for Graph Columns: Draw a curve through a non-linear set of points as you see fit. *(Locally weighted scatterplot smoothing.)
  • Color-coded correlation grid for graph columns: Identify at a glance any factors that are not controlled independently of each other, that is, orthogonally; also useful for seeing how one response correlates to another.

Greater flexibility in data display and export

  • Journal feature to export data directly to Microsoft Word or Powerpoint: Fast and formatted for you to quickly generate a presentable report on your experimental results.
  • Improved copy/paste of Final Equation from the analysis of variance (ANOVA) report to Microsoft Excel: This not only saves tedious transcription of coefficients but it also sets up a calculator for you to 'plug and chug', that is, enter into the spreadsheet cells what values for the inputs you'd like to evaluate and see what the model predicts for your response.
  • New XML* script commands for exporting point predictions: Helpful for situations where one wants to automate the transfer of vital outputs from Design-Expert to other programs. *(Extensible Markup Language)

More powerful tools for modeling

  • All-hierarchical model (AHM) selection: Sort through all possible models up to the one you designed the experiment for, but all the while maintain hierarchy of terms so you do not end up with something ill-formulated.
  • Special quartic Scheffé polynomial included in automatic selection for mixture modeling: Sometimes this added degree (4th!) of non-linear blending helps to better shape the response surface - making it better for predictive purposes.

More choices when custom-designing your experiment

  • Enter a single factor constraint for response surface designs: Creates a 'hard' limit on inputs that cannot go beyond a certain point (such as zero time) physically or operationally.

More capability for numerical optimization

  • Include Cpk* as a goal: Meet quality goals explicitly. *(A process capability index widely used for Six Sigma and Design for Six Sigma programs.)

Enhanced design evaluation

  • One-sided option added to FDS* graph: Size your design properly for a verification experiment done to create a QBD** design space. 
    *(Fraction of design space) **(Quality by Design - a protocol promoted by the US Food & Drug Administration (FDA).)

Many things made nicer, easier, more configurable and faster

  • Diagnostics report now can be sorted by any of the statistics listed: This enables a more informative ordering than by run number (the default).

Niceties that only statisticians might truly appreciate

  • Mean correction for transformation bias when responses displayed in original scale: All you need to know is that our statisticians figured out how to eliminate a tricky, little-known bias!
  • Propagation of error (POE) carried out to the second derivative: Makes POE more accurate - that's a good thing!
  • Allow averaging of categoric factors when viewing a graph: Convenient for getting the big picture of where to find robust operating settings.
  • Display confidence bands with or without POE added: Easier to match output with other programs that do not offer POE features like this.
  • Add unblocked results to evaluation of blocked experiments: Aids in comparing designs on the basis of matrix measures.

Good news for network administrators

New more flexible and easier-to-use license manager with greater power to serve enterprise users: For example, network 'seats' can be checked out to individual laptops and multiple opening of the program on a specific computer will only use one seat.

Other features

In addition to the above, see these features from Design-Expert 8 and earlier.


For a flowchart of the tutorials, please check back. It is coming soon.

Data and simulation files associated with the tutorials need to be downloaded separately.

The Design-Expert 9 tutorials can be read with Acrobat Reader (9.0 or higher recommended) which you may download from Adobe at For your convenience, they are listed [in square brackets] with their corresponding tutorial below. To download a file, right-click on the link and choose "Save Target As..." or "Save Link As..." depending upon your browser.

For resources in other languages, click here.

There are a few DX8 tutorials noted below that will be replaced by DX9 versions as they become available.

Tutorials (DX & DE)SizeDescription
Adobe Acrobat Document General Multilevel-Categoric One-Factor1.99 MBBuild and analyze a one-factor factorial design, "Bowling"
Adobe Acrobat Document General Multilevel-Categoric Factorial1.73 MBBuild and analyze a three-level design with factorial analysis, "Battery" [Battery.simx]
Adobe Acrobat Document Two-Level Factorial2.64 MBTwo-level factorial design, "Filtrate" [Filtrate.simx]
Adobe Acrobat Document Foldover Designs1.24 MBAugment a factorial design by foldover (DX8 tutorial) [Biker.dxp]
Adobe Acrobat Document Taguchi Designs641.36 KBTaguchi designs (DX8 tutorial) [Taguchi-L16.dxp]
Adobe Acrobat Document Split-Plot General Multilevel-Categoric Factorial1.03 MBBuild and analyze a split-plot factorial design, "Pulp" [Pulp.simx]

Tutorials (DX Only)SizeDescription
Adobe Acrobat Document One Factor RSM1.86 MBBuild and analyze a one-factor RSM design, "Driving"
Adobe Acrobat Document Multi-Factor RSM3.46 MBMultifactor response surface, "RSM" [RSM.dxpx & RSM-a.dxpx]
Adobe Acrobat Document Optimal Numeric1.05 MBAdding multifactor constraints to an optimal design
Adobe Acrobat Document Mixture Designs2.64 MBBuild and analyze a simplex-lattice design, "Mix" [Mix.dxpx & Mix-a.dxpx]
Adobe Acrobat Document Combined Mixture-Process1.65 MBBuild and analyze a mixture design with process factors, "Fish Patties" [Fish Patties.simx]
Adobe Acrobat Document Optimal Categoric1.28 MBAdding categoric factors to an optimal design (DX8 tutorial) [Peel.dxp]
Adobe Acrobat Document Historical RSM824.21 KBAnalysis of highly correlated data, "Longley" (DX8 tutorial) [Longley.dxp]

Feature TourSizeDescription
Adobe Acrobat Document Simple Sample416.36 KBHow to use simple sample designs [Simple Sample-Motor Shaft.dxpx]
Adobe Acrobat Document Split-Plot Factorial698.29 KBHow to build a factorial split-plot [PCR with data.dxpx & PCR.simx]
Adobe Acrobat Document Split-Plot Optimal298.23 KBHow to build an optimal split-plot [PCR as Optimal Build (starter).dxpx]
Adobe Acrobat Document Verification Runs455.64 KBHow to use verification runs [RSM-a.dxpx] (DX9 Only)
Adobe Acrobat Document Confirmation Runs323.3 KBHow to enter confirmation runs [RSM-a.dxpx] (DX9 Only)

Adobe Acrobat Document What's new in version 9?1.82 MBIllustrated highlights of new features in Design-Expert 9
Adobe Acrobat Document New Factorial Design Builder370.85 KBDX9 factorial design builder: screenshots and comparison to DX8
Windows Installer Design-Expert® 9 Tutorials23.66 MBInstalls all Design-Expert tutorials and data files.
Windows Installer Design-Ease® 9 Tutorials11.43 MBInstalls all Design-Ease tutorials and data files.
Adobe Acrobat Document DX9 Tutorial Flowchart135.32 KB

System Requirements

Design-Expert 9 (Single User or Network Client)
Processor 500 MHz
Hard Drive 100 MB free space
RAM 512 MB
Display 800x600
Operating System
  • Windows XP SP3 or
  • Windows Vista SP2 or
  • Windows 7 SP1 or
  • Windows 8, 8.1
  • Windows 10
Microsoft .NET Framework Version 4.0


Server for Network Version (License Manager)
Hard Drive 50 MB disk space

Operating System


On a server:

  • Windows 2003 or
  • Windows 2008 or
  • Windows 2012

Or a computer:

  • Windows XP SP3 or
  • Windows Vista SP2 or
  • Windows 7 SP1 or
  • Windows 8, 8.1
  • Windows 10

Network version requires installation of the Reprise License Manager (RLM) as a service.

May be installed on a virtual server that is assigned a static ethernet MAC address.