Map an item model, item parameters, and person trait score into a information vector
Map an item model, item parameters, and person trait score into a information vector
rpf.info(ii, ii.p, where, basis = 1)
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 |
Fisher information
Dodd, B. G., De Ayala, R. J. & Koch, W. R. (1995). Computerized adaptive testing with polytomous items. Applied psychological measurement 19(1), 5-22.
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")
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