Dim(object, groups)
object
|
an object inheriting from class corStruct ,
representing a 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. |
groups
is missing, it returns the Dim
attribute of
object
; otherwise, calculates the dimensions associated with
the grouping factor.N
|
length of groups
|
M
| number of groups |
maxLen
| maximum number of observations in a group |
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 observations in each group, beginning from zero |
Dim
, Dim.corSpatial
library(lme) data(Orthodont) Dim(corAR1(), getGroups(Orthodont))