Talk:Fractional factorial design

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)[reply]

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) :[reply]

              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)[reply]