envelope.pgam {pgam} | R Documentation |
A normal plot with simulated envelope of the residual is produced.
## S3 method for class 'pgam': envelope(object, type = "deviance", size = 0.95, rep = 19, optim.method = NULL, epsilon = 0.001, maxit = 100, plot = TRUE, title="Simulated Envelope of Residuals", verbose = FALSE, ...)
object |
object of class pgam holding the fitted model |
type |
type of residuals to be extracted. Default is deviance . Options are described in residuals.pgam |
size |
value giving the size of the envelope. Default is .95 which is equivalent to a 95% band |
rep |
number of replications for envelope construction. Default is 19 |
optim.method |
optimization method to be passed to pgam and therefore to optim |
epsilon |
convergence control to be passed to pgam |
maxit |
convergence control to be passed to pgam |
plot |
if TRUE a plot of the envelope is produced |
title |
title for the plot |
verbose |
if TRUE a sort of information is printed during the running time |
... |
further arguments to plot function |
Method for the generic function envelope
.
Sometimes the usual Q-Q plot shows an unsatisfactory pattern of the residuals of a model fitted and we are led to think that the model is badly specificated. The normal plot with simulated envelope indicates that under the distribution of the response variable the model is OK if only a few points fall off the envelope.
If object
is of class pgam
the envelope is estimated and optionally plotted, else if is of class envelope
then it is only plotted.
An object of class envelope
holding the information needed to plot the envelope.
Washington Leite Junger wjunger@ims.uerj.br and Antonio Ponce de Leon ponce@ims.uerj.br
Atkinson, A. C. (1985) Plots, transformations and regression : an introduction to graphical methods of diagnostic regression analysis. Oxford Science Publications, Oxford.
pgam
, predict.pgam
, residuals.pgam