This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: 1 Confounding What is confounding If two or more effects are confounded, then: the individual effects cannot be estimated only their sum can be estimated More on confounding run 1 A B C AB AC BC ABC mean 1 + + + + + + + + 222 2 + + + + 122 3 + + + + 212 4 +  + + + 112 5 + + + + 221 6 + + + + 121 7 + +  + + 211 8 +   + + + 111 2 3 confounding If we use the ABC = +1 half, then A = BC (main effect of A is confounded with BC interaction) B = AC (main effect of B is confounded with AC interaction) C = AB (main effect of C is confounded with AB interaction) 1 = ABC (intercept is confounded with ABC interaction) 2 4 confounding If we use the ABCD = +1 half, then main effects confounded with threeway interactions Example: A confounded with BCD twoway interactions confounded with other twoway interac tions Example: AB confounded with CD intercept confounded with fourway interaction 1 confounded with ABCD 2 5 confounding If we use the ABCDE = +1 half, then main effects confounded with fourway interactions Example: A confounded with BCDE twoway interactions confounded with threeway interactions Example: AB confounded with CDE...
View
Full
Document
This note was uploaded on 01/09/2009 for the course ORIE 312 taught by Professor D.ruppert,p.jacks during the Spring '08 term at Cornell University (Engineering School).
 Spring '08
 D.RUPPERT,P.JACKS

Click to edit the document details