ASReml-S reference manual - VSN International

3.13 Generalized linear models 313.11 WeightsWeighted analyses are achieved by using the weights = wt argument to asreml, wherewt is a variate in the data frame. If these are relative weights (to be scaled by theunits variance) then this is all that is required; for exammple, the number of samplingunits (wt=c(3, 1, 3, . . . )). If they are absolute weights, that is, the reciprocal of knownvariances, the units variance should be constrained to 1. This can be done by one of twoways:1. one of the methods described in Section 3.9.1, that is, editing a default R parameterlist object with asreml.gammas.ed() (start.values=T) or create and edit an externaltext file with start.values=”filename”, changing the constraint of the units varianceto F.2. Set the units variance with the family argument> fm