residuals(object, levels, conLin)
nlmeStruct,
representing a list of mixed-effects model components, such as
reStruct,
corStruct, and
varFunc objects.
object. Level
values increase from outermost to innermost grouping, with
level zero corresponding to the population fitted values. Defaults to
the highest or innermost level of grouping.
"Xy", corresponding to a regression
matrix (
X) combined with a response vector (
y), and
"logLik", corresponding to the log-likelihood of the
underlying nlme model. Defaults to
attr(object, "conLin").
level,
the returned value is a vector with the residuals at the desired
level; else, when multiple grouping levels are specified in
level
, the returned object is a matrix with
columns given by the residuals at different levels.
NOTE: This method function is primarily used inside the
nlme
function.
Bates, D.M. and Pinheiro, J.C. (1998) "Computational methods for multilevel models" available in PostScript or PDF formats at http://nlme.stat.wisc.edu/