rpf (version 0.8)

rpf.info: 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

Arguments

m

an item model

param

item parameters

theta

the trait score(s)

Value

• Fisher information

References

Muraki, E. (1993) Information functions of the generalized partial credit model. Applied Psychological Measurement, 17(4), 351-363.

Examples

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