plot.nls: Plotting diagnostics for an 'nls' object

In OnofriAndreaPG/aomisc: Statistical methods for the agricultural sciences

Plotting diagnostics for an nls object

Description

Three plots (selectable by the argument 'which') are currently available: a plot of residuals against fitted values (which = 1), a Normal Q-Q plot (which = 2) and a plot of predicted against expected (line) and observed (symbols). By default, the first graph is provided. As for the third graph, we can either plot all the data (type= "all") or the group means (type = "means"; the default)

Usage

  
  ## S3 method for class 'nls'
plot(x, type = "means", 
                     xlim = NULL, res = 100, 
                     which = 3, ...)

Arguments

x	an object of class 'nls'
type	it can be either "means" or "all". In the first case, the group means are plotted for the third graph. It is iìonly used when which = 3
xlim	The limits for the x-axis (x1, x2)
res	For 'which = 3', it is the resolution of the fitted line
which	The type of graph: can be 1, 2 or 3 (see description)
...	additional graphical arguments

Details

It mimicks the behaviour of the function plot.lm()

Author(s)

Andrea Onofri

Examples

data(degradation)
mod <- nls(Conc ~ NLS.expoDecay(Time, a, k),
               data = degradation)
plot(mod, which = 3)

OnofriAndreaPG/aomisc documentation built on Sept. 15, 2024, 9:53 p.m.