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*To*: "'asreml@chiswick.anprod.CSIRO.au'" <asreml@chiswick.anprod.CSIRO.au>*Subject*: variance modelling*From*: Joe Daley <j.daley@cqu.edu.au>*Date*: Mon, 27 Aug 2001 14:27:54 +1000*Cc*: Joe Daley <j.daley@cqu.edu.au>*Sender*: asreml-owner@lamb.arm.li.csiro.au

G'day Asreml I am trying to model some g2 data using a mixed model y = XB + Zu + e where u is (2*numg1 + numg2) vector, numg1 is the number of generation 1 animals and numg2 is the number of generation 2 animals. Generation 1 animals are comprised of sires and dams, numg1 = numsg1 + numdg1. u can be partitioned into u = [ ua | ub | a ]T, a is a random animal effect derived from the numerator relationship matrix. ua can be partitioned into ua = [ uas | uad ] and ub can be partitioned ub = [ ubs | ubd ], here a or b distinguish between two types of effects and s or d distinguish between sire or dam origin of the effect. where ua ~ (0, 2aGa) and ub ~ (0, 2bGb) this means that sire and dam a effects are coming from the same variance 2a with a known correlation structure Ga as sires and dams from g1 are correlated with each other. Sire and dam b effects are similar. I am fitting the asreml model Traitname ~ mu !r sire.sirea dam.dama sire.sireb dam.damb animal Here sire and dam are factors with a level for each sire and dam while Sirea, dama sireb and damb are the respective a or b coefficients for each g2 animal. Initially I want to set 2a = 2b so that all ua and ub effects are coming From one variance, all the u's are now grouped. How do I get asreml to model traitname this way knowing that sirea, dama, sireb and damb are all from the one variance and relationships exist between sirea and dama and sireb and damb. I want to get a blup estimate for each level of sire and dam for both a and b effects and overlay the predetermined correlation matrices Ga and Gb. Secondly I want to repeat this without the constraint 2a = 2b , unequal Variances. Any help is appreciated. Cheers Joe Daley PhD researcher Central Queensland University -- Asreml mailinglist archive: http://www.chiswick.anprod.csiro.au/lists/asreml

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