You can fit the model on the component scale if you want to use vpredict() and the standard errors. Therefore, you have to be careful as ASReml-R does not automatically convert variance ratios to variance components or their standard errors. As the variance parameter names can sometimes be long, the variance parameters are represented in vpredict() by the strings “V1”, “V2”,… in the order they appear in the vparameters component of the asreml object.īy default, for simple models ASReml fits on the ‘gamma’ scale, which means that the returned variance components are variance ratios (for more details please see the ASReml-R Reference Manual, version 4). Functions of variance components and their standard errors can be obtained from the vpredict() function.