R: Item Parameters from Two PISA Studies

data.pisaPars {sirt}

R Documentation

Item Parameters from Two PISA Studies

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

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

[Package sirt version 4.1-15 Index]