Dear all,

I am doing a mixed model, and I would like put some restrict for the estimation of my fixed effects.
For example, I have a fixed population effect. There is 7 populations, so I give to asreml a matrix with 7 columns and use the function grp() to consider one factor.
I would like to add a restriction for their estimation effect as :
pop1 + pop2 + pop3 + pop4 + pop5 + pop6 + pop7 = 0

How is possible to do?

My model is the following one :
model2.asr = asreml(fixed = Pheno ~ 1+grp(pop), group = QTL, random=~ ped(Ind, var=T), ginverse=list(Ind=ColInvSimil), data=dataASREML,sed=T)

Thanks for your answers,
Regards,

Nicolas.