vpredict {asreml}R Documentation

Functions of variance parameters.

Description

Form functions of variance components from an asreml object.

Usage

vpredict(object, xform)

Arguments

object

An asreml object.

xform

A two-sided formula, where the left-hand side labels the estimate. The right-hand side defines the derived parameter as an algebraic expression. Any of the estimated parameters can be included, represented as "V1", "V2", "V3", ... in the order they appear in object$vparameters. Parentheses, and simple functions like log, exp, sqrt are allowed.

Details

The standard error of the computed value is calculated using the delta method using deriv(), which calculates algebraic derivatives for a wide range of expressions. The variance components are represented in the expression by "V1", "V2", "V3", etc.

Value

A single-row data frame with components:

Estimate

The result of the algebraic expression.

SE

The estimated standard error.


[Package asreml version 4.1.0.106 Index]