rpf.info: Map an item model, item parameters, and person trait score...

In rpf: Response Probability Functions

Map an item model, item parameters, and person trait score into a information vector

Description

Map an item model, item parameters, and person trait score into a information vector

Usage

rpf.info(ii, ii.p, where, basis = 1)

Arguments

ii	an item model
ii.p	item parameters
where	the location in the latent distribution
basis	if more than 1 factor, a positive basis vector

Value

Fisher information

References

Dodd, B. G., De Ayala, R. J. & Koch, W. R. (1995). Computerized adaptive testing with polytomous items. Applied psychological measurement 19(1), 5-22.

Examples

i1 <- rpf.drm()
i1.p <- c(.6,1,.1,.95)
theta <- seq(0,3,.05)
plot(theta, rpf.info(i1, i1.p, t(theta)), type="l")

rpf documentation built on Aug. 22, 2023, 1:06 a.m.