irt (version 0.2.9)

as.data.frame.cat_output: Convert a cat_output object into a data.frame.

Description

This function converts cat_output objects to a data.frame object.

Usage

# S3 method for cat_output
as.data.frame(x, row.names = NULL, optional = FALSE, ...)

Value

A data frame with the following columns:

true_ability

True ability of the simulee

est_before

Ability estimate before administration of an item.

se_before

Standard error before administration of an item.

testlet_id

Administered testlet's ID.

item_id

Administered item's ID.

resp

Response to the item

est_after

Ability estimate after the administration of an item.

se_after

Standard error after administration of an item.

Arguments

x

An cat_output object

row.names

NULL or a character vector giving the row names for the data frame. Missing values are not allowed.

optional

logical. If TRUE, setting row names and converting column names

...

additional arguments

Author

Emre Gonulates

Examples

ip <- generate_ip(n = 40)
cd <- create_cat_design(ip = ip, next_item_rule = 'mfi',
                        termination_rule = 'max_item',
                        termination_par = list(max_item = 10))
cat_data <- cat_sim(true_ability = rnorm(1), cd = cd)
as.data.frame(cat_data)