plres.nls2 - Plot an nls2 Object for Studying the Residuals


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DESCRIPTION
USAGE
REQUIRED-ARGUMENTS
OPTIONAL-ARGUMENTS
CONSTRAINTS
DETAILS
SEE-ALSO
EXAMPLE



DESCRIPTION:

Plot the components of an `nls2.object' that may be help the study of the residuals.


USAGE:
plres.nls2(nls2.object, 
           step=nls2.object$nb.steps, 
           wanted=list(F.R=T, R.R=T, I.R=F, X.R=F, V.R2=F), 
           absolute=F, st=F, smooth=F, 
           labels=NULL, title="", figs=c(2, 2), 
           ask.pause=T, ask.modify=F, ...)

REQUIRED ARGUMENTS:
nls2.object
an object of class `nls2'.

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OPTIONAL ARGUMENTS:

step
when the nls2.object has been created by an alternated method of estimation, the index of the step requested. By default, the last step.
wanted
a list that specifies the graphs requested; Its components are logics that should be TRUE if the corresponding graphs are requested.
"wanted" components and their meanings are:
F.R: the residuals are plotted against the fitted values of the response.
R.R: the residuals are plotted against the immediatly preceding residuals: residuals(i) against residuals(i-1).
I.R: the residuals are plotted against their indexes: residuals(i) against i.
X.R: the residuals are plotted against the independent variables.
V.R2: the squared residuals are plotted against the fitted values of the variance. This option is ignored when the argument `st' is TRUE.
absolute
a logic that should be TRUE if the absolute values of the residuals are to be added on the graphs corresponding to F.R, I.R and X.R.
st
a logic that should be TRUE if the standardized residuals are to be plotted rather than the residuals.
smooth
a logic that should be TRUE if the points of the observed values are to be joined. If so, they are joined by a dotted line after smoothing.
labels,title,figs,ask.pause,ask.modify,...

See `pldnls2'.

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CONSTRAINTS:

- A graphical device should have been previously activated.



`nls2.object' should contain intermediate results: the "it.steps" option should have been set in the control argument of the command that created the object. (See `nls2.control', argument `it.steps'.)

- The data frame containing the observations must be available, (its name is nls2.object$call$data). It is then assumed that this data frame has been neither deleted nor modified since the nls2.object was created.


DETAILS:

This function is a method for the generic function `plres' for class `nls2'. It can be invoked by calling `plres' for an object of the appropriate class, or directly by calling `plres.nls2' regardless of the class of the object.


SEE ALSO:

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EXAMPLE:

   X11()
   plres(nls2.out, wanted=list(R.R=T), st=T, figs=c(3,3))

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- Mon Sep 30 1996 -