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

rpf.info {rpf} | R Documentation

## 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")

[Package rpf version 0.59 Index]