plotINFO {eRm}

R Documentation

Plot Information For 'eRm' objects

Description

Calculates and plots the individual or summed item information by Samejima (1969)

Usage

plotINFO(ermobject, type = "both", theta = seq(-6, 6, length.out = 1001L), 
legpos = "right", ...)

Arguments

ermobject	An object of class 'eRm'.
type	A string denoting the type of information to be plotted. Currently supports "item", "test" and "both" (default).
theta	Supporting or sampling points on the latent trait.
legpos	Defines the positioning of the legend, as in plotICC.
...	Further arguments. xlab sets the label of the x axis. ylabI and ylabT control the labeling of the item or test information plot. mainI and mainT set the titles for item/test information plots.

Author(s)

Thomas Rusch

References

Samejima, F. (1969) Estimation of latent ability using a response pattern of graded scores. Psychometric Monographs, 17.

See Also

The function to calculate the item or test information, item_info and test_info.

Examples

res <- PCM(pcmdat)
plotINFO(res)

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