Whats New in DesignExpert version 7 General Improvements

What’s New in Design-Expert version 7 General Improvements Pat Whitcomb March 24, 2006 Design-Expert version 7 1

What’s New Ø General improvements § Design evaluation § Diagnostics § Updated graphics § Better help § Miscellaneous cool new stuff Ø Factorial design and analysis Ø Response surface design Ø Mixture design and analysis Ø Combined design and analysis Design-Expert version 7 2

Design Evaluation Ø User specifies what order terms to ignore. Ø Can evaluate by design or response. Ø New options for more flexibility. § User specifies D/s ratios for power calculation. § User specifies what to report. § User specified options for standard error plots. Ø Annotation added to design evaluation report. Design-Expert version 7 3

Design Evaluation Specify Order of Terms to Ignore Focus attention on what is most important. Design-Expert version 7 4

Design Evaluation Evaluate by Design or Response Useful when a response has missing data. Design-Expert version 7 5

Design Evaluation New Options for More Flexibility Ø User specifies D/s ratios for power calculation. Ø User specifies what to report. Ø User specified options for standard error plots. Design-Expert version 7 6

Design Evaluation Annotated Design Evaluation Report Design-Expert version 7 7

Diagnostics Ø Diagnostics Tool has two sets of buttons: § “Diagnostics” and “Influence”. Ø New names and limits. § Internally studentized residual = studentized residual v 6. § Externally studentized residual = outlier t v 6. • The externally studentized residual has exact limits. Ø New – DFFITS Ø New – DFBETAS Design-Expert version 7 8

Diagnostics Tool has Two Sets of Buttons ei = residuali Design-Expert version 7 9

Diagnostics Exact Limits t(a/n, n-p'-1) p' is the number of model terms including the intercept n is the total number of runs Design-Expert version 7 10

Diagnostics DFFITS measures the influence the ith observation has on the predicted value. (See Myers, Raymond: “Classical and Modern Regression with Applications”, 1986, Duxbury Press, page 284. ) It is the studentized difference between the predicted value with observation i and the predicted value without observation i. DFFITS is the externally studentized residual magnified by high leverage points and shrunk by low leverage points. It is a sensitive test for influence and points outside the limits are not necessarily bad just influential. These runs associated with points outside the limits should be investigated to for potential problems. DFFITS is very sensitive and it is not surprising to have a point or two falling outside the limits, especially for small designs. Design-Expert version 7 11

Diagnostics DFBETAS measures the influence the ith observation has on each regression coefficient. (See Myers, Raymond: “Classical and Modern Regression with Applications”, 1986, Duxbury Press, page 284. ) The DFBETASj, i is the number of standard errors that the jth coefficient changes if the ith observation is removed. Design-Expert version 7 12

Updated Graphics Ø New color by option. Ø Full color contour and 3 D plots. Ø Design points and their projection lines added to 3 D plots. Ø Grid lines on contour plots. Ø Cross hairs read coordinates on plots. Ø Magnification on contour plots. Ø User specified detail on contour “Flags”. Ø Choice of “LSD Bars”, “Confidence Bands” or “None” on one factor and interaction plots. Design-Expert version 7 13

New Color by Option Design-Expert version 7 14

Full Color Contour and 3 D Plots Design-Expert version 7 15

Design Points on 3 D Plots Design-Expert version 7 16

Grid lines on contour plots Design-Expert version 7 17

Cross Hairs Design-Expert version 7 18

Magnification on Contour Plots Design-Expert version 7 19

Specify Detail on Contour “Flags” Design-Expert version 7 20

“LSD Bars” & “Confidence Bands” Design-Expert version 7 21

Better Help Ø Improved help Ø Screen tips Ø Movies (mini tutorials) Design-Expert version 7 22

Miscellaneous Cool New Stuff Ø “Graph Columns” now has its own node. Ø Highlight points in the design layout or on a diagnostic graph for easy identification. Ø Right click and response cell and ignore it. Ø Improved design summary. Ø Numerical optimization results now carried over to graphical optimization and point prediction. Ø Export graph to enhanced metafile (*. emf). Ø Exporting to other software packages. Design-Expert version 7 23

Graph Columns Node Design-Expert version 7 24

Highlight Points Design-Expert version 7 25

Sort by Row Status right click in the upper left hand corner Design-Expert version 7 26

Ignore Response Cells Design-Expert version 7 27

Improved Design Summary New in version 7: § Means and standard deviations for factors and responses. § The ratio of maximum to minimum added for responses. Design-Expert version 7 28

Numerical optimization results carried over to graphical optimization and point prediction. Design-Expert version 7 29

Export Graphs as Enhanced Metafile “File” “Export Graph to file. . . ” Design-Expert version 7 30

Save and Export Ø Save as: § Design-Expert version 6 file (*. dx 6) § XML Document (*. xml) § Var. Tran file (*. vat) Ø Export: § “Export Design to file. . . ” → text file (*. txt) § “Export Design to AAO file. . . ” → text file (*. txt) Design-Expert version 7 31