asremlPlus (version 4.4.55)

iterate.asrtests: Subject the fitted asreml.obj stored in an asrtests.object to further iterations of the fitting process.

Description

In an effort to improve convergence, subject the fitted asreml.obj stored in an asrtests.object to further iterations of the fitting process; the model specification is not changed. While no change is made to the test.summary, the wald.tab is updated.

Usage

# S3 method for asrtests
iterate(asrtests.obj, denDF="numeric", trace = FALSE, ...)

Value

An object of S3-class asrtests.

Arguments

asrtests.obj

an asrtests.object containing the components (i) asreml.obj, (ii) wald.tab, and (iii) test.summary.

denDF

Specifies the method to use in computing approximate denominator degrees of freedom when wald.asreml is called. Can be none to suppress the computations, numeric for numerical methods, algebraic for algebraic methods or default, the default, to automatically choose numeric or algebraic computations depending on problem size. The denominator degrees of freedom are calculated according to Kenward and Roger (1997) for fixed terms in the dense part of the model.

trace

If TRUE then partial iteration details are displayed when ASReml-R functions are invoked; if FALSE then no output is displayed.

...

further arguments passed to update.asreml.

Author

Chris Brien

References

Kenward, M. G., & Roger, J. H. (1997). Small sample inference for fixed effects from restricted maximum likelihood. Biometrics, 53, 983-997.

See Also

as.asrtests, asrtests.object, newfit.asreml

Examples

if (FALSE) {
  current.asrt <- iterate(current.asrt)
}