pg_0154
5.
Process Improvement
5.4.
Analysis of DOE data
5.4.1.
What are the steps in a DOE analysis.
General
flowchart
for
analyzing
DOE data
Flowchart of DOE Analysis Steps
DOE Analysis Steps
Analysis
steps:
graphics,
theoretical
model,
actual
model,
validate
model, use
model
The following are the basic steps in a DOE analysis.
Look at the data. Examine it for outliers, typos and obvious problems. Construct as many
graphs as you can to get the big picture.
Response distributions (
histograms
,
box plots
, etc.)
r
Responses versus
time order scatter plot
(a check for possible time effects)
r
Responses versus factor levels
(first look at magnitude of factor effects)
r
Typical DOE plots (which assume standard models for effects and errors)
Main effects mean plots
s
Block plots
s
Normal or
half-normal plots
of the effects
s
r
1.
5.4.1. What are the steps in a DOE analysis.
http://www.itl.nist.gov/div898/handbook/pri/section4/pri41.htm (1 of 2) [5/7/2002 4:02:06 PM]
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