Item Parameters from Two PISA Studies

Description

This data frame contains item parameters from two PISA studies. Because the Rasch model is used, only item difficulties are considered.

Usage

data(data.pisaPars)

Format

A data frame with 25 observations on the following 4 variables.

item

Item names

testlet

Items are arranged in corresonding testlets. These names are located in this column.

study1

Item difficulties of study 1

study2

Item difficulties of study 2

Results