Description of Science data

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).

References

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

Author

Phil Chalmers rphilip.chalmers@gmail.com

Examples

if (FALSE) { # \dontrun{
itemstats(Science)

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