plot.btmodel: Visualizing Bradley-Terry Models

In psychotools: Psychometric Modeling Infrastructure

Visualizing Bradley-Terry Models

Description

Base graphics plotting function for Bradley-Terry models.

Usage

## S3 method for class 'btmodel'
plot(x, worth = TRUE, index = TRUE, names = TRUE,
  ref = TRUE, abbreviate = FALSE, type = NULL, lty = NULL,
  xlab = "Objects", ylab = NULL, ...)

Arguments

x	an object of class "btmodel".
worth	logical. Should worth parameters (or alternatively coefficients on log-scale) be displayed?
index	logical. Should different indexes for different items be used?
names	logical. Should the names for the objects be displayed?
ref	logical. Should a horizontal line for the reference level be drawn? Alternatively, ref can also be numeric or character to employ a reference level different from that stored in x.
abbreviate	logical or numeric. Should object names be abbreviated? If numeric this controls the length of the abbreviation.
type	plot type. Default is "b" if index is TRUE.
lty	line type.
xlab, ylab	x and y axis labels.
...	further arguments passed to plot.

See Also

btmodel

Examples

## data
data("GermanParties2009", package = "psychotools")

## Bradley-Terry model
bt <- btmodel(GermanParties2009$preference)
plot(bt)
plot(bt, worth = FALSE)
plot(bt, index = FALSE)

psychotools documentation built on May 29, 2024, 8:12 a.m.