R: Plot Output from regsubsets Function in leaps package

subsets {car}

R Documentation

Plot Output from regsubsets Function in leaps package

Description

The regsubsets function in the leaps package finds optimal subsets of predictors. This function plots a measure of fit (see the statistic argument below) against subset size.

Usage

subsets(object, ...)

## S3 method for class 'regsubsets'
subsets(object, 
    names=abbreviate(object$xnames, minlength = abbrev), 
    abbrev=1, min.size=1, max.size=length(names), legend, 
    statistic=c("bic", "cp", "adjr2", "rsq", "rss"), 
    las=par('las'), cex.subsets=1, ...)

Arguments

`object`	a `regsubsets` object produced by the `regsubsets` function in the leaps package.
`names`	a vector of (short) names for the predictors, excluding the regression intercept, if one is present; if missing, these are derived from the predictor names in `object`.
`abbrev`	minimum number of characters to use in abbreviating predictor names.
`min.size`	minimum size subset to plot; default is `1`.
`max.size`	maximum size subset to plot; default is number of predictors.
`legend`	`TRUE` to plot a legend of predictor names; defaults to `TRUE` if abbreviations are computed for predictor names. The legend is placed on the plot interactively with the mouse. By expanding the left or right plot margin, you can place the legend in the margin, if you wish (see `par`).
`statistic`	statistic to plot for each predictor subset; one of: `"bic"`, Bayes Information Criterion; `"cp"`, Mallows's Cp; `"adjr2"`, R^2 adjusted for degrees of freedom; `"rsq"`, unadjusted R^2; `"rss"`, residual sum of squares.
`las`	if `0`, ticks labels are drawn parallel to the axis; set to `1` for horizontal labels (see `par`).
`cex.subsets`	can be used to change the relative size of the characters used to plot the regression subsets; default is `1`.
`...`	arguments to be passed down to `subsets.regsubsets` and `plot`.

Value

NULL if the legend is TRUE; otherwise a data frame with the legend.

Author(s)

John Fox

References

Fox, J. (2008) Applied Regression Analysis and Generalized Linear Models, Second Edition. Sage.

Fox, J. and Weisberg, S. (2011) An R Companion to Applied Regression, Second Edition, Sage.

Examples

if (interactive() && require(leaps)){
	subsets(regsubsets(undercount ~ ., data=Ericksen))
}

[Package car version 2.0-12 Index]