mirt (version 1.42)

Science: Description of Science data

Description

A 4-item data set borrowed from ltm package in R, first example of the grm() function. See more complete documentation therein, as well as Karlheinz and Melich (1992).

Author

Phil Chalmers

References

Karlheinz, R. and Melich, A. (1992). Euro-Barometer 38.1: Consumer Protection and Perceptions of Science and Technology. INRA (Europe), Brussels. [computer file]

Examples

if (FALSE) {
itemstats(Science)

mod <- mirt(Science, 1)
plot(mod, type = 'trace')
}