logDet.corStruct {nlme} | R Documentation |

## Extract corStruct Log-Determinant

### Description

This method function extracts the logarithm of the determinant of a
square-root factor of the correlation matrix associated with
`object`

, or the sum of the log-determinants of square-root
factors of the list of correlation matrices associated with
`object`

.

### Usage

## S3 method for class 'corStruct':
logDet(object, covariate, ...)

### Arguments

`object` |
an object inheriting from class `corStruct` ,
representing a correlation structure. |

`covariate` |
an optional covariate vector (matrix), or list of
covariate vectors (matrices), at which values the correlation matrix,
or list of correlation matrices, are to be evaluated. Defaults to
`getCovariate(object)` . |

`...` |
some methods for this generic require additional
arguments. None are used in this method. |

### Value

the log-determinant of a square-root factor of the correlation matrix
associated with `object`

, or the sum of the log-determinants of
square-root factors of the list of correlation matrices associated
with `object`

.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`logLik.corStruct`

, `corMatrix.corStruct`

### Examples

cs1 <- corAR1(0.3)
logDet(cs1, covariate = 1:4)

[Package

*nlme* version 3.1-66

Index]