nlme (version 3.1-31)

qqnorm.gls: Normal Plot of Residuals from a gls Object

Description

Diagnostic plots for assessing the normality of residuals the generalized least squares fit are obtained. The form argument gives considerable flexibility in the type of plot specification. A conditioning expression (on the right side of a | operator) always implies that different panels are used for each level of the conditioning factor, according to a Trellis display.

Usage

## S3 method for class 'gls':
qqnorm(y, form, abline, id, idLabels, grid, ...)

Value

a diagnostic Trellis plot for assessing normality of residuals.

See Also

gls, plot.gls

Examples

data(Ovary)
fm1 <- gls(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary,
           correlation = corAR1(form = ~ 1 | Mare))
qqnorm(fm1, abline = c(0,1))