info: Plot Test Information Function

In nando11235813/raschreg: Item Response Theory models including explanatory variables of the ability parameter

Description

The function info computes (and by default plots) the test information function from a fitted Rasch (regression) model.

Usage

  info(mod, theta = NULL, item = NULL,
       main_item = NULL, main_total = NULL,
       which = 'both', plot = TRUE)

Arguments

mod	Fitted Rasch (regression) model whose information curve is to be ploted.
theta	numeric; values of ability at which information is to be calculated.
item	A character string for ICC identification. Only applicable when information is available for all items.
main_item	A main title for the items information plot.
main_total	A main title for the total information plot.
which	Which information plot should be presented. Possible values are 'item', 'total' and 'both'. If 'lord' the MAPE estimator is bias-corrected according to Lord's procedure. If 'MAPE' the posterior (approximated) likelihood is maximized. Default to 'lord'.
plot	logical; whether or not information curves should be ploted.

Details

Displays information regarding the whole set of items considered in the model. Information is computed for each item and for the test as a whole.

Value

A data.frame containing the values of theta, information of every item, and the test information.

Author(s)

Fernando Massa, [e-mail]

See Also

plot.rasch, pim, forest, itemfit

Examples

n   <- 100
X   <- sim_rasch(n)
mod <- rasch(X)
info(mod)

nando11235813/raschreg documentation built on Oct. 2, 2021, 3:11 p.m.