Plot a Rasch Model Fit

Plot a Rasch Model Fit

Usage

# S3 method for class 'birt_fit'
plot(x, type = c("icc", "wright", "info", "trace"), items = NULL, ...)

Arguments

x

A birt_fit object.

type

Which plot to make:

"icc"

Item Characteristic Curves — P(correct) vs ability.

"wright"

Wright Map — persons & items on same scale.

"info"

Test Information Function — where the test measures best.

"trace"

MCMC trace plots — check if chains mixed well.

items

Which items to plot (integer indices). Default: all.

...

Extra arguments passed to the plotting function.