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Unformatted text preview: el factors. Hlgh A f$j Presentation second, when the experiment has been preceded by
experiments in which a particular design or technique
proved to be useful; third, when, on considering designs, analyses, and plots, the experimenters may
want to change information in items 2-7-for
example, narrowing the scope of the objective or increasing the number of settings for a control variable.
9. High A Factors A and B interact, but no
quadratic term Is present (assumed). High A Figure 6. Graphical lb
Interaction Low Table la - No A-B Interaction
Low A A*B R Simple, linear, additive
model Is sufficient. 1;: b2y2+ . . . of Interactions. different sizes of experimental units, and logistics.
Then, it may be useful to (a) choose candidate designs, (b) review them with the experimenters in the
context of the collected information to determine if
any of the designs should be dropped from further
consideration, and (c) write an experimental design
proposal that contains (at least) one or more proposed designs; a comparative analysis of the designs
with respect to number of runs, resolution (or aliased
effects), number of distinct control variable combinations, prediction error standard deviation, and so
forth; a design recommendation with justification;
and copies of the completed guide sheets.
When an experimental design has been selected,
the sheets are used to help launch supportive tasks
required for the experiment to be successful. This Table 6. Interactions
variable x shift
NOTE. Response y shift z shift Vendor a shift Speed - - P
- - - - - - - Feed P
P - Height - vanables are P = profile difference. F = surface ftnish, and D = surface - F, D defects. TECHNOMETRICS. FEBRUARY 1993, VOL. 35, NO. 1 12 DAVID E. COLEMAN AND DOUGLAS involves issues addressed in items 11 and 12 on the
guide sheet. Additionally,
there will be logistical
planning and planning for measurement capability
studies, process capability studies, preexperiments
to quantify the effects of various factors (held-constant and nuisance) on response variables, and trial
In regard to item 12 of Figure 2, an experiment
without a coordinator will...
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This document was uploaded on 02/12/2014.
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