Item Parameters from Two PISA Studies — data.pisaPars • sirt

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)

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

item: Item names
testlet: Items are arranged in corresponding testlets. These names are located in this column.
study1: Item difficulties of study 1
study2: Item difficulties of study 2