sirt: data.pisaPars – R documentation

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data.pisaPars

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

Supplementary Item Response Theory Models

v3.10-118

GPL (>= 2)

Authors

Alexander Robitzsch [aut,cre] (<https://orcid.org/0000-0002-8226-3132>)

Initial release

2021-09-22 17:45:34