plot.pers {pairwise}

S3 Plotting Person - Item Map

Description

S3 plotting method for object of class"pers"

Usage

## S3 method for class 'pers'
plot(
  x,
  ra = NULL,
  sortdif = FALSE,
  main = NULL,
  ylab = "Logits",
  itemNames = TRUE,
  fillCol = "grey60",
  lineCol = "grey40",
  cex = 0.7,
  pos = 4,
  breaks = "Sturges",
  pch = 1,
  ...
)

Arguments

x

object of class"pers"

ra

an integer, defining the (logit) range for y-axis

sortdif

logical wether to order items by difficulty

main

see plot

ylab

see plot

itemNames

logical wether to use itemnames in the resulting plot

fillCol

color for bar filling of the ability histogram

lineCol

color for bar lines of the ability histogram

cex

see text

pos

see text

breaks

see hist

pch

see points

...

other parameters passed to hist and text.