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3. Modeling
Assigning the value " – 1" to the low level and "+ 1" to the high level of each factor amounts to making a change of unit of measurement and a change of origin. When a factor A varies from A
1
to A
2
, the origin is equal to A
0
= 1/2 (A
1
+ A
2
). The transition from the variable "A" to the reduced centered variable "x" is made by the following formula:
where the pitch p = A 2 – A 0 ...
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Modeling
Two-level fractional plane
Bibliography
Text references
Software
(Non-exhaustive list)
Nemrod, logiciel construit à LPRAI, Université d'Aix-Marseille http://www.nemrodw.com
Sas, Editor Institute
Spad, DECISIA/SPAD https://www.test-and-go.com/fr/ct
Splus,...
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