Talk:Fractional factorial design
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Context Needed
[edit]This article needs going over and context added. For example, it talks about "case III" and "resolution III, IV, and V" without any indication as to what these terms mean. -- 21:03, 27 January 2007 (UTC)
effect multiplication needs explaining
[edit]This concept is crucial to understanding what a defining relation is and how it is derived. But it is not explained (how does D=A*B imply I=ABD?). I have done some tweaks in other ways but may revisit this soon. Feel free to beat me to it. Baccyak4H (Yak!) 17:13, 23 August 2007 (UTC)
Factorial designs using the + and - convention for the two levels make effect multiplication rules
intuitive. 830199wk (talk) 04:56, 27 October 2016 (UTC)From a user's perspective, any factor interracting with itself generates 1 (or I in this essay) :
e.g. if the pattern (total of 4 experiments) for factor 'd' is (-,-,+,+), then the effect "product" dd = (-,-,+,+)(-,-,+,+)=(+,+,+,+) = I ).
e.g The defining relation for generator e, where e is confounded with the 4-level interraction,
e=abcd
is I = ee = eabcd , or I = abcde . — Preceding unsigned comment added by 830199wk (talk • contribs) 11:31, 26 October 2016 (UTC)