plot_PImap {autoRasch} R Documentation

Plot The Person-Item Map

Description

This function maps the distribution of the persons' abilities and the items difficulties along the latent continuum.

Usage

plot_PImap(
obj,
main = NULL,
xlab = NULL,
cex = NULL,
cex.lab = NULL,
cex.axis = NULL,
cex.main = NULL,
lwd = NULL,
v = NULL,
th_dif = 1e-05
)


Arguments

 obj The object of class 'pcm'. main main title of the plot; see plot.default(). xlab Label for the x-axis; see plot.default(). cex A numerical value giving the amount by which plotting text and symbols should be magnified relative to the default; see par(). cex.lab The magnification to be used for x and y labels relative to the current setting of cex; see par(). cex.axis The magnification to be used for axis annotation relative to the current setting of cex; see par(). cex.main The magnification to be used for main titles relative to the current setting of cex; see par(). lwd The line width, a positive number, defaulting to 1; see par(). v Variable names used th_dif The threshold at which a DIF effect is still considered a DIF.

Value

There are no values to return. Instead, it shows a graphical map of the estimated ability and the estimated difficulty on the same scale.

Examples

## Not run:
groupsMap <- matrix(c(rep(1,50),rep(0,50)),ncol = 1, dimnames = list(c(1:100),c("V1")))
pcmdif_res <- pcm_dif(shortDIF, groups_map = groupsMap)
plot_PImap(pcmdif_res)

## End(Not run)



[Package autoRasch version 0.2.2 Index]