object
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an object inheriting from class gls , representing
a generalized least squares fitted model.
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form
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an optional one-sided formula specifying the desired type of
plot. Any variable present in the original data frame used to obtain
object can be referenced. In addition, object itself
can be referenced in the formula using the symbol
"." . Conditional expressions on the right of a |
operator can be used to define separate panels in a Trellis
display. The expression on the right hand side of form and to
the left of a | operator must evaluate to a residuals
vector. Default is ~ resid(., type = "p") ,
corresponding to a normal plot of the standardized residuals.
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abline
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an optional numeric value, or numeric vector of length
two. If given as a single value, a horizontal line will be added to the
plot at that coordinate; else, if given as a vector, its values are
used as the intercept and slope for a line added to the plot. If
missing, no lines are added to the plot.
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id
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an optional numeric value, or one-sided formula. If given as
a value, it is used as a significance level for a two-sided outlier
test for the standardized residuals (random effects). Observations with
absolute standardized residuals (random effects) greater than the
1 - value/2 quantile of the standard normal distribution are
identified in the plot using idLabels . If given as a one-sided
formula, its right hand side must evaluate to a logical, integer, or
character vector which is used to identify observations in the
plot. If missing, no observations are identified.
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idLabels
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an optional vector, or one-sided formula. If given as a
vector, it is converted to character and used to label the
observations identified according to id . If given as a
one-sided formula, its right hand side must evaluate to a vector
which is converted to character and used to label the identified
observations. Default is the innermost grouping factor.
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grid
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an optional logical value indicating whether a grid should
be added to plot. Default depends on the type of Trellis plot used:
if xyplot defaults to TRUE , else defaults to
FALSE .
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...
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optional arguments passed to the Trellis plot function.
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