plot.fwdglm: Forward Search in Generalized Linear Models

Description Usage Arguments Author(s) References See Also Examples

Description

This function plots the results of a forward search analysis in generalized linear models.

Usage

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## S3 method for class 'fwdglm'
plot(x, which.plots = 1:11, squared = FALSE, scaled =FALSE, 
     ylim = NULL, xlim = NULL, th.Res = 4, th.Lev = 0.25, sig.Tst =2.58, 
     sig.score = 1.96, plot.pf = FALSE, labels.in.plot = TRUE, ...)

Arguments

x

a "fwdglm" object.

which.plots

select which plots to draw, by default all. Each graph is addressed by an integer:

  1. deviance residuals

  2. leverages

  3. maximum deviance residuals

  4. minimum deviance residuals

  5. coefficients

  6. t statistics, i.e. coef.est/SE(coef.est)

  7. likelihood matrix: deviance, deviance explained, pseudo R-squared, dispersion parameter

  8. score statistic for the goodness of link test

  9. forward Cook's distances

  10. modified forward Cook's distances

  11. weights used at each step of the forward search for the units included

squared

logical, if TRUE plots squared deviance residuals.

scaled

logical, if TRUE plots scaled coefficient estimates.

ylim

a two component vector for the min and max of the y axis.

xlim

a two component vector for the min and max of the x axis.

th.Res

numerical, a threshold for labelling the residuals.

th.Lev

numerical, a threshold for labelling the leverages.

sig.Tst

numerical, a value used to draw the confidence interval on the plot of the t statistics.

sig.score

numerical, a value used to draw the confidence interval on the plot of the score test statistic.

plot.pf

logical, in case of binary response if TRUE graphs contain all the step of the forward search, otherwise only those in which there is no perfect fit.

labels.in.plot

logical, if TRUE units are labelled in the plots when required.

...

further arguments passed to or from other methods.

Author(s)

Originally written for S-Plus by: Kjell Konis kkonis@insightful.com and Marco Riani mriani@unipr.it
Ported to R by Luca Scrucca luca@stat.unipg.it

References

Atkinson, A.C. and Riani, M. (2000), Robust Diagnostic Regression Analysis, First Edition. New York: Springer, Chapter 6.

See Also

fwdglm, fwdlm, fwdsco.

Examples

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## Not run: 
data(cellular)
mod <- fwdglm(y ~ as.factor(TNF) + as.factor(IFN), data=cellular, 
              family=poisson(log), nsamp=200)
summary(mod)
plot(mod)

## End(Not run)

forward documentation built on Jan. 11, 2020, 9:33 a.m.

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