residuals.gls: Extract gls Residuals

Description

The residuals for the linear model represented by object are extracted.

# S3 method for gls
residuals(object, type, ...)

a vector with the residuals for the linear model represented by

object.

object: an object inheriting from class "gls", representing a generalized least squares fitted linear model, or from class gnls, representing a generalized nonlinear least squares fitted linear model.
type: an optional character string specifying the type of residuals to be used. If "response", the "raw" residuals (observed - fitted) are used; else, if "pearson", the standardized residuals (raw residuals divided by the corresponding standard errors) are used; else, if "normalized", the normalized residuals (standardized residuals pre-multiplied by the inverse square-root factor of the estimated error correlation matrix) are used. Partial matching of arguments is used, so only the first character needs to be provided. Defaults to "response".
...: some methods for this generic function require additional arguments. None are used in this method.

José Pinheiro and Douglas Bates bates@stat.wisc.edu

fm1 <- gls(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary,
           correlation = corAR1(form = ~ 1 | Mare))
residuals(fm1)

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