Plot an lme or nls object
Diagnostic plots for the linear mixed-effects 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. If form
is a one-sided formula, histograms of the
variable on the right hand side of the formula, before a |
operator, are displayed (the Trellis function histogram
is
used). If form
is two-sided and both its left and
right hand side variables are numeric, scatter plots are displayed
(the Trellis function xyplot
is used). Finally, if form
is two-sided and its left had side variable is a factor, box-plots of
the right hand side variable by the levels of the left hand side
variable are displayed (the Trellis function bwplot
is used).
## S3 method for class 'lme' plot(x, form, abline, id, idLabels, idResType, grid, ...) ## S3 method for class 'nls' plot(x, form, abline, id, idLabels, idResType, grid, ...)
x |
an object inheriting from class |
form |
an optional formula specifying the desired type of
plot. Any variable present in the original data frame used to obtain
|
abline |
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. |
id |
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, or normalized residuals. Observations with
absolute standardized (normalized) residuals greater than the 1
- value/2 quantile of the standard normal distribution are
identified in the plot using |
idLabels |
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 |
idResType |
an optional character string specifying the type of
residuals to be used in identifying outliers, when |
grid |
an optional logical value indicating whether a grid should
be added to plot. Default depends on the type of Trellis plot used:
if |
... |
optional arguments passed to the Trellis plot function. |
a diagnostic Trellis plot.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
fm1 <- lme(distance ~ age, Orthodont, random = ~ age | Subject) # standardized residuals versus fitted values by gender plot(fm1, resid(., type = "p") ~ fitted(.) | Sex, abline = 0) # box-plots of residuals by Subject plot(fm1, Subject ~ resid(.)) # observed versus fitted values by Subject plot(fm1, distance ~ fitted(.) | Subject, abline = c(0,1))
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.