coef.corStruct {nlme} | R Documentation |

## Coefficients of a corStruct Object

### Description

This method function extracts the coefficients associated with the
correlation structure represented by `object`

.

### Usage

## S3 method for class 'corStruct':
coef(object, unconstrained, ...)
## S3 method for class 'corStruct':
coef(object, ...) <- value

### Arguments

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

`unconstrained` |
a logical value. If `TRUE` the coefficients
are returned in unconstrained form (the same used in the optimization
algorithm). If `FALSE` the coefficients are returned in
"natural", possibly constrained, form. Defaults to `TRUE` . |

`value` |
a vector with the replacement values for the coefficients
associated with `object` . It must be a vector with the same length
of `coef{object}` and must be given in unconstrained form. |

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

### Value

a vector with the coefficients corresponding to `object`

.

### SIDE EFFECTS

On the left side of an assignment, sets the values of the coefficients
of `object`

to `value`

. `Object`

must be initialized (using
`Initialize`

) before new values can be assigned to its
coefficients.

### Author(s)

Jose Pinheiro and Douglas Bates

### References

Pinheiro, J. C. and Bates, D. M. (2000), *Mixed-Effects Models in S
and S-PLUS*, Springer, New York.

### See Also

`corAR1`

, `corARMA`

,
`corCAR1`

, `corCompSymm`

,
`corExp`

, `corGaus`

, `corLin`

,
`corRatio`

, `corSpatial`

, `corSpher`

,
`corSymm`

,`Initialize`

### Examples

cst1 <- corARMA(p = 1, q = 1)
coef(cst1)

[Package

*nlme* version 3.1-80

Index]