Dim.corSpatial {nlme} | R Documentation |

## Dimensions of a corSpatial Object

### Description

if `groups`

is missing, it returns the `Dim`

attribute of
`object`

; otherwise, calculates the dimensions associated with
the grouping factor.

### Usage

## S3 method for class 'corSpatial':
Dim(object, groups, ...)

### Arguments

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

`groups` |
an optional factor defining the grouping of the
observations; observations within a group are correlated and
observations in different groups are uncorrelated. |

`...` |
further arguments to be passed to or from methods. |

### Value

a list with components:

`N` |
length of `groups` |

`M` |
number of groups |

`spClass` |
an integer representing the spatial correlation class;
0 = user defined class, 1 = `corSpher` , 2 = `corExp` , 3 =
`corGaus` , 4 = `corLin` |

`sumLenSq` |
sum of the squares of the number of observations per
group |

`len` |
an integer vector with the number of observations per
group |

`start` |
an integer vector with the starting position for the
distance vectors in each group, beginning from zero |

### Author(s)

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

### See Also

`Dim`

, `Dim.corStruct`

### Examples

Dim(corGaus(), getGroups(Orthodont))

[Package

*nlme* version 3.1-57

Index]