data.pisaPars: 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

1

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


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