Dimensions of a corStruct Object
if groups is missing, it returns the Dim attribute of
object; otherwise, calculates the dimensions associated with
the grouping factor.
## S3 method for class 'corStruct' Dim(object, groups, ...)
object |
an object inheriting from class |
groups |
an optional factor defining the grouping of the observations; observations within a group are correlated and observations in different groups are uncorrelated. |
... |
some methods for this generic require additional arguments. None are used in this method. |
a list with components:
N |
length of |
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 |
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Dim(corAR1(), getGroups(Orthodont))
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