kft5 {pairwise}

Dichotomous example data in Rost 2004

Description

Data for 300 subjects answering to 5 dichotomous items out of 'Kognitiver Fähigkeits Test' [Cognitive Skills Test] (KFT - Gaedike & Weinläder, 1976) . This data is used as an example in the textbook by J. Rost (2004) to demonstrate some principles of rasch measurement.

Usage

  data(kft5)

Format

A "matrix" containing 5 columns (variables) and 300 rows (obsevations).

Details

The instrument KFT and the data are described in Rost (2004) at page 95.

References

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

Heller, K, Gaedike, A.-K & Weinläder, H. (1976). Kognitiver Fähigkeits-Test (KFT 4-13). Weinheim: Beltz.

Examples

data(kft5)
dim(kft5)
###########
# frequencies
ftab(kft5)
# Itemparameter to be compared with Rost (2004), page 120.
summary(pair(kft5)) 
# Itemparameter to be compared with Rost (2004), page 120.
summary(pers(pair(kft5)))