Download - Design of Experiments Webinar.pdf
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Neil W. Polhemus, CTO, StatPoint Technologies, Inc.
Design of Experiments Using
Statgraphics Centurion
Copyright 2011 by StatPoint Technologies, Inc.
Web site: www.statgraphics.com
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Design of Experiments Wizard
Phase 1: Creating an experiment
Phase 2: Analyzing the results
Phase 3: Further experimentation
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Phase 1: Creating an experiment
Phase 1: Creating an experiment
Step 1: Define responses
Step 2: Define experimental factors
Step 3: Select design
Step 4: Specify model
Step 5: Select runs
Step 6: Evaluate design
Step 7: Save design
Phase 2: Analyzing the results
Phase 3: Further experimentation
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Phase 2: Analyzing the results
Phase 1: Creating an experiment
Phase 2: Analyzing the results
Step 8: Analyze data
Step 9: Optimize responses
Step 10: Save results
Phase 3: Further experimentation
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Phase 3: Further experimentation
Phase 1: Creating an experiment
Phase 2: Analyzing the results
Phase 3: Further experimentation
Step 11: Augment design
Step 12: Extrapolate
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Example – from Response Surface
Methodology by Myers and
Montgomery
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Find the settings of time, temperature and catalyst that maximize
the conversion percentage of a chemical process while keeping
the thermal activity as close as possible to 57.5.
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DOE Wizard – Main Window
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Step 1: Define responses
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Step 2: Define experimental factors
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Step 3: Select design
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Step 3: Select design (cont.)
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Step 3: Select design (cont.)
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Step 3: Select design (cont.)
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Datasheet
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Step 4: Select model
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Step 5: Select runs (D-optimal
design only)
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Step 6: Evaluate design
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Plot of design space
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RSM Example
8.3 10.3 12.3 14.3 16.3 18.3
time
160170
180190
200210
temperature
1.6
1.9
2.2
2.5
2.8
3.1
3.4
ca
taly
st
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Prediction variance plot
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Prediction Variance Plotcatalyst=2.5
8.110.1
12.114.1
16.118.1
time
150
170
190
210
230
temperature
0
0.2
0.4
0.6
0.8
1
Stn
d.
err
or
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Power curve
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Power Curve for A:time
alpha = 5.0%, sigma estimated from total error with 10 d.f.
-4 -2 0 2 4
True effect/sigma
0
0.2
0.4
0.6
0.8
1
Pro
bab
ilit
y o
f d
ete
cti
on
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Do the experiment!
Then enter the results:
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Step 8: Analyze data
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Step 8: Analyze data (cont.)
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ANOVA table
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Pareto chart
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Standardized Pareto Chart for conversion
0 2 4 6 8
Standardized effect
A:time
AB
AA
BC
BB
B:temperature
CC
C:catalyst
AC +
-
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Exclude effects
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Final models
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Standardized Pareto Chart for conversion
0 2 4 6 8
Standardized effect
A:time
BC
BB
B:temperature
CC
C:catalyst
AC +
-
Standardized Pareto Chart for thermal activity
0 2 4 6 8 10
Standardized effect
AA
C:catalyst
A:time
+
-
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Step 9: Optimize responses
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Step 9: Optimize responses (cont.)
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Step 9: Optimize responses (cont.)
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3-D contour plot
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Desirability Plotcatalyst=2.31889
8.1 10.1 12.1 14.1 16.1 18.1
time
150170
190210
230
temperature
1.6
1.9
2.2
2.5
2.8
3.1
3.4
cata
lyst
Desirability
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Desirability
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Overlaid contour plots
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Overlay Plot
catalyst=2.34412
conversion
thermal activity
8.1 10.1 12.1 14.1 16.1 18.1
time
150
170
190
210
230
tem
pera
ture
75.0
83.0
91.0
99.0
107.0115.0123.057.0 59.0 61.0 63.0 65.0 67.0 69.0 71.0
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Step 10: Save results
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Step 11: Augment design
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Step 12: Extrapolate
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Step 12: Extrapolate (cont.)
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More… (next webinar)
Creating and using RPDs (Robust Parameter Designs)
Analyzing designs with both process and mixture
components
Using D-optimal designs to fix a botched experiment
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