nlme (version 3.1-57)

Dim.corSpatial: 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, \dots)

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

See Also

Dim, Dim.corStruct

Examples

Dim(corGaus(), getGroups(Orthodont))