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Last data update: 2014.03.03

R: Profile pairs

pairs.profile

R Documentation

Profile pairs

Description

This function produces pairwise plots of profile traces, profile sketches, and ellipse approximations to confidence intervals.

Usage

## S3 method for class 'profile'
pairs(x, labels = c(names(x), "Profile tau"), panel = lines, invert = TRUE, 
    plot.tau = TRUE, plot.trace = TRUE, plot.sketch = TRUE, 
	plot.ellipse = FALSE, level = 0.95, ...)

Arguments

`x`	An object of class `profile`, generally the result of the `profile()` function.
`labels`	The labels to use for each variable. These default to the variable names.
`panel`	The function to use to draw the sketch in each panel.
`invert`	Whether to swap the axes so things look better.
`plot.tau`	Whether to do the profile tau (profile t) plots.
`plot.trace`	Whether to do the profile trace plots.
`plot.sketch`	Whether to do the profile sketch plots.
`plot.ellipse`	Whether to do the ellipse approximations.
`level`	The nominal confidence level for the profile sketches and ellipses.
`...`	Other plotting parameters.

Details

This function implements the plots used in Bates and Watts (1988) for nonlinear regression diagnostics.

Side Effects

Produces a plot on the current device for each pair of variables in the profile object.

References

Bates and Watts (1988), Nonlinear Regression Analysis & its Applications.

Examples

 # Plot everything for the Puromycin data
 data(Puromycin)
 Purboth <- nls(formula = rate ~ ((Vm + delV * (state == "treated"))
   * conc)/(K + conc), data = Puromycin,
   start = list(Vm = 160, delV = 40, K = 0.05))
 Pur.prof <- profile(Purboth)
 pairs(Pur.prof, plot.ellipse = TRUE)