Neoffi5 {pairwise}

Polytomous example data in Rost 2004

Description

Data for 1000 subjects answering to 5 polytomous items assessing neuroticism contained in the german version of the NEO–five–factor–inventory (NEOFFI) by Borkenau and Ostendorf (1991). This data is used as an example in the textbook by J. Rost (2004) to demonstrate some principles of rasch measurement.

Usage

  data(Neoffi5)

Format

A "matrix" containing 5 columns (variables) and 1000 rows (obsevations).

Details

An detailed description of the data can be found in Rost (2004) at page 202.

References

Rost, J. (2004). Lehrbuch Testtheorie - Testkonstruktion (2 nd Ed.) Huber: Bern.

Borkenau. P. & Ostendorf F. (1991). Ein Fragebogen zur Erfassung fünf robuster Persönlichkeitsfaktoren. Diagnostica, 37, (1), 29–41.

Examples

data(Neoffi5)
dim(Neoffi5)
###########
# frequencies
ftab(Neoffi5)
# Itemparameter to be compared with Rost (2004), page 211.
summary(pair(Neoffi5)) 
# Itemparameter to be compared with Rost (2004), page 213.
summary(pers(pair(Neoffi5)))