Description Usage Arguments Details Value References See Also Examples

View source: R/MxFitFunctionGREML.R

This function creates a new `MxFitFunctionGREML`

object.

1 2 | ```
mxFitFunctionGREML(dV=character(0), aug=character(0),
augGrad=character(0), augHess=character(0))
``` |

`dV` |
Vector of character strings; defaults to a character vector of length zero. If a value of non-zero length is provided, it must be a |

`aug` |
Character string; defaults to a character vector of length zero. Any elements after the first are ignored. The string should name a 1x1 |

`augGrad` |
Character string; defaults to a character vector of length zero. Any elements after the first are ignored. The string should name a |

`augHess` |
Character string; defaults to a character vector of length zero. Any elements after the first are ignored. The string should name a |

Making effective use of arguments `dV`

, `augGrad`

, and `augHess`

will usually require a custom `mxComputeSequence()`

. The derivatives of the REML loglikelihood function with respect to parameters can be internally computed from the derivatives of the 'V' matrix supplied via `dV`

. These loglikelihood derivatives will be valid as long as (1) the derivatives of 'V' evaluate to symmetric matrices the same size as 'V,' and (2) the model contains no `MxConstraint`

s. Internally, the derivatives of the 'V' matrix are assumed to be symmetric, and the elements above their main diagonals are ignored.

Currently, if any derivatives are provided via `dV`

, then derivatives must be provided for *every* free parameter in the MxModel.

Argument `aug`

is intended to allow users to provide penalty functions or prior likelihoods in order to approximate constraints or to regularize optimization. The user is warned that careless use of this augmentation feature may undermine the validity of his/her statistical inferences.

Returns a new object of class `MxFitFunctionGREML`

.

The OpenMx User's guide can be found at http://openmx.ssri.psu.edu/documentation.

See `MxFitFunctionGREML`

for the S4 class created by `mxFitFunctionGREML()`

. For more information generally concerning GREML analyses, including a complete example, see `mxExpectationGREML()`

.

Other fit functions:
`mxFitFunctionMultigroup`

, `mxFitFunctionML`

,
`mxFitFunctionWLS`

, `mxFitFunctionAlgebra`

,
`mxFitFunctionR`

, `mxFitFunctionRow`

More information about the OpenMx package may be found here.

1 2 | ```
gff <- mxFitFunctionGREML()
str(gff)
``` |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.